Twin City Fan & Blower

Twin City Fan & Blower BULLETIN 315 August 2000 SERIES 2000 DWDI BACKWARD INCLINED FANS TYPE BAB

Series 2000 BAB DWDI Backward Inclined Fans This bulletin features our new BAB Series 2000 DWDI (double width, double inlet), backward inclined, nonoverloading centrifugal fan. These fans are designed to provide economical and efficient handling of large volumes of air for most low to medium pressure HVAC systems and air handling applications. They are ideally suited for use by original equipment manufacturers in custom or semi-custom air handlers or designed into built-up air handling systems constructed on site. The newly developed single surface backward curved wheel has operating characteristics similar to an airfoil wheel. The unique wide profile aerodynamically curved blade design provides efficient performance over a wide operating range while maintaining very low sound power levels. These high efficiencies mean that you can achieve greater airflow and higher pressures using the same size BAB fan as our competitors. Often you can use a smaller size BAB fan without increasing motor size or sound levels. The versatile and economical design of the fan housing and supports make the BAB a perfect fan for many OEM applications. The BAB fan s efficiency, economy, and versatility provide just the right combination for today s competitive environment. Capabilities Sizes 9" to 39" wheel diameter Capacities of 500 to 70,000 CFM Static pressures to 7" w.g. Universal mounting positions Dual shaft drive extensions 200,000 hour L-50 bearing life standard Contents Capabilities..........................2 Construction Features...................3 Accessories..........................3 Engineering Data......................4 Performance Data.....................5 Dimensional Data.....................12 Typical Specifications..................14 CERTIFIED RATINGS SOUND AIR AND PERFORMANCE AIR MOVEMENT AND CONTROL ASSOCIATION INTERNATIONAL, INC. Twin City Fan & Blower certifies that the units shown herein are licensed to bear the AMCA Seal. The ratings are based on tests and procedures performed in accordance with AMCA Publication 211 and AMCA Publication 311 and comply with the requirements of the AMCA Certified Ratings Program. Refer to Bulletin 316 for sound power levels. 2000 Twin City Fan Companies, Ltd. Bulletin illustrations cover the general appearance of Twin City Fan & Blower products at the time of publication and we reserve the right to make changes in design and construction at any time without notice. 2 TCF&B Bulletin 315

Construction Features Wheel The unique design of the BAB single thickness backward inclined wheel provides efficiencies and sound power levels equal to or better than many other manufacturers airfoil wheels. The aerodynamic blade profile and wider wheel combine to create a more efficient fan design which significantly improves efficiency and reduces sound power levels, especially in the lower frequencies which are the hardest to control. Housing BAB fan housings for size 091 through 351 are constructed of galvanized steel. The side sheets are fastened to the scroll housing with an airtight lock seam connection. BAB fan housings for the size 391 are constructed of steel, with continuous welded seams, and are finished with a rust preventive primer and enamel top coat. Housing support frames provide rigidity and allow the fan to be rotated to any of the four standard discharge positions: top horizontal, downblast, bottom horizontal, or upblast. Shaft BAB shafts are turned, ground and polished cold rolled steel accurately sized for the proper bearing size. The shafts are extended at both ends for flexibility in mounting V-belt drives. Bearings and Bearing Supports All BAB Series 2000 fans are designed with regreasable pillow block bearings which provide a minimum life of 200,000 hours (L-50) at maximum cataloged speed. These bearings are mounted to a heavy duty steel support structure to ensure strength and rigidity. Accessories Access Door A bolted access door is available for wheel inspection and maintenance. Drain A threaded pipe coupling is available welded to the lowest point in the housing scroll to permit wash water or condensation to drain from the fan. Inlet Screens Safety screens are available for mounting in the fan inlet. Inlet Vanes Available for all sizes of BAB fans. Variable inlet vanes provide economical, stable, and efficient air volume control. Inlet vanes are nested in the inlet cone to provide for space saving installation. Extended Lube Lines Plastic lubrication lines run from both fan bearings to grease fittings at a common point located on the fan housing. Discharge Flanges Punched or unpunched discharge angle flanges are available for all fan sizes and discharges. Additional Accessories Twin City Fan & Blower can provide a complete assembled and tested fan package which consists of the Series 2000 BAB fan, motor, and V-belt drive mounted on a common base, with or without spring isolators. The unit is run tested and balanced as an entire assembly before shipping. The complete package can include: Motors V-belt drives Belt guards Isolation bases TCF&B Bulletin 315 3

Engineering Data The performance tables in this catalog are based on fans handling standard air at a density of 0.075 pounds per cubic foot. This is equivalent to air at 70 F at sea level (29.92" Hg barometric pressure). Thus, when specified performance is at a density different than standard, it must be converted to the equivalent standard conditions before entering the performance tables. The equivalent standard conditions can be calculated by using the Temperature and Altitude Density Ratios shown in Table 1 below. Table 1. Temperature and Altitude Density Ratios ALTITUDE IN FEET ABOVE SEA LEVEL AIR 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 15000 20000 TEMP BAROMETRIC PRESSURE IN INCHES OF MERCURY F 29.92 28.86 27.82 26.82 25.84 24.90 23.98 23.09 22.22 21.39 20.58 16.89 13.75 70 1.000 0.964 0.930 0.896 0.864 0.832 0.801 0.772 0.743 0.714 0.688 0.564 0.460 100 0.946 0.912 0.880 0.848 0.818 0.787 0.758 0.730 0.703 0.676 0.651 0.534 0.435 150 0.869 0.838 0.808 0.770 0.751 0.723 0.696 0.671 0.646 0.620 0.598 0.490 0.400 200 0.803 0.774 0.747 0.720 0.694 0.668 0.643 0.620 0.596 0.573 0.552 0.453 0.360 Table 2. Maximum RPM, Wheel Weights, and WR 2 FAN SIZE MAXIMUM WHEEL LB-FT 2 RPM WT. (LBS.) WR 2 091 4500 7.0 0.7 101 4500 8.5 1.2 111 4200 10.0 1.9 121 3600 15.0 3.3 141 3378 20.0 5.7 161 3011 26.0 7.4 181 2804 34.0 14.0 201 2434 45.0 24.0 221 2181 63.0 36.0 251 1904 89.0 64.0 281 1669 125.0 128.0 321 1508 132.0 183.0 351 1365 163.0 268.0 391 1201 176.0 358.0 Table 3. Bare Fan Weights FAN SIZE BARE FAN WEIGHT (LBS.) 091 37 101 45 111 52 121 70 141 94 161 124 181 150 201 206 221 273 251 367 281 491 321 632 351 802 391 964 4 TCF&B Bulletin 315

Performance Data Wheel Dia.: 8.82 in. Tip Speed (FPM) = 2.27 x RPM BAB 091 Outlet Area: 0.89 sq. ft. Max. BHP = 0.023 (RPM 1000) 3 0.25" SP 0.5" SP 0.75" SP 1" SP 1.25" SP 1.5" SP 1.75" SP 2" SP 2.5" SP 3" SP 600 674 1231 0.04 1484 0.08 1701 0.11 1889 0.15 2065 0.19 2230 0.23 2388 0.27 700 787 1354 0.06 1580 0.09 1787 0.13 1970 0.17 2134 0.22 2290 0.26 2437 0.31 2578 0.35 2848 0.45 800 899 1488 0.08 1686 0.11 1878 0.16 2057 0.20 2218 0.25 2364 0.29 2504 0.35 2638 0.40 2892 0.50 3132 0.62 900 1011 1626 0.10 1802 0.14 1978 0.18 2146 0.23 2304 0.28 2450 0.33 2584 0.39 2711 0.44 2953 0.56 3181 0.68 1000 1124 1769 0.12 1928 0.17 2087 0.22 2244 0.27 2393 0.32 2537 0.38 2671 0.43 2795 0.49 3026 0.61 3245 0.74 1100 1236 1914 0.15 2061 0.20 2204 0.25 2349 0.31 2491 0.37 2626 0.42 2757 0.48 2882 0.55 3109 0.68 3318 0.81 1200 1348 2061 0.19 2198 0.24 2330 0.30 2462 0.35 2594 0.41 2723 0.48 2848 0.54 2969 0.61 3196 0.74 3402 0.88 1300 1461 2210 0.23 2338 0.28 2461 0.34 2582 0.41 2704 0.47 2827 0.54 2945 0.60 3060 0.67 3283 0.82 3488 0.96 1400 1573 2361 0.27 2481 0.34 2596 0.40 2709 0.46 2821 0.53 2935 0.60 3049 0.67 3159 0.75 3372 0.90 3575 1.05 1500 1685 2512 0.33 2625 0.39 2734 0.46 2840 0.53 2945 0.60 3051 0.67 3157 0.75 3263 0.83 3467 0.98 3663 1.14 1600 1798 2665 0.39 2771 0.46 2875 0.53 2975 0.60 3074 0.68 3172 0.75 3271 0.83 3371 0.91 3567 1.07 3756 1.24 1700 1910 2818 0.46 2919 0.53 3017 0.60 3113 0.68 3206 0.76 3299 0.84 3391 0.92 3485 1.01 3672 1.18 3854 1.35 1800 2022 2973 0.53 3068 0.61 3161 0.69 3253 0.77 3342 0.85 3429 0.94 3517 1.02 3604 1.11 3781 1.29 3957 1.47 1900 2135 3127 0.62 3218 0.70 3307 0.78 3394 0.86 3479 0.95 3563 1.04 3646 1.13 3729 1.22 3895 1.41 4063 1.60 2000 2247 3282 0.71 3369 0.79 3454 0.88 3537 0.97 3619 1.06 3699 1.15 3778 1.24 3857 1.34 4015 1.53 4174 1.73 2100 2360 3438 0.81 3520 0.90 3601 0.99 3681 1.08 3760 1.18 3837 1.27 3913 1.37 3988 1.47 4138 1.67 4289 1.88 2200 2472 3594 0.93 3673 1.02 3750 1.11 3827 1.21 3903 1.31 3977 1.40 4050 1.51 4122 1.61 4266 1.82 4409 2.03 2300 2584 3750 1.05 3826 1.15 3900 1.24 3974 1.34 4047 1.44 4119 1.55 4189 1.65 4259 1.76 4396 1.97 2400 2697 3907 1.18 3979 1.28 4051 1.39 4122 1.49 4192 1.59 4261 1.70 4329 1.81 4396 1.92 2500 2809 4064 1.33 4133 1.43 4202 1.54 4270 1.65 4338 1.75 4405 1.87 4471 1.98 BAB 101 Wheel Dia.: 9.84 in. Tip Speed (FPM) = 2.58 x RPM Outlet Area: 1.11 sq. ft. Max. BHP = 0.040 (RPM 1000) 3 0.25" SP 0.5" SP 0.75" SP 1" SP 1.25" SP 1.5" SP 1.75" SP 2" SP 2.5" SP 3" SP BHP 750 670 1119 0.06 1346 0.10 1541 0.14 1709 0.18 1867 0.23 2014 0.28 2155 0.34 900 804 1258 0.08 1453 0.12 1636 0.17 1800 0.22 1946 0.28 2083 0.33 2214 0.39 2339 0.45 2577 0.58 1050 937 1407 0.11 1574 0.16 1740 0.21 1896 0.27 2041 0.33 2172 0.39 2294 0.45 2411 0.52 2635 0.65 2844 0.80 1200 1071 1562 0.14 1709 0.20 1856 0.26 2000 0.32 2137 0.38 2267 0.45 2388 0.52 2500 0.59 2710 0.74 2910 0.89 1350 1205 1721 0.18 1854 0.25 1984 0.31 2115 0.38 2242 0.45 2365 0.52 2483 0.59 2595 0.67 2800 0.83 2989 1.00 1500 1339 1883 0.24 2005 0.30 2122 0.38 2239 0.45 2357 0.52 2472 0.60 2583 0.68 2691 0.76 2896 0.93 3081 1.11 1650 1473 2047 0.30 2160 0.37 2268 0.45 2373 0.53 2480 0.61 2587 0.69 2692 0.78 2794 0.86 2991 1.04 3176 1.23 1800 1607 2213 0.38 2317 0.46 2418 0.54 2516 0.62 2613 0.71 2710 0.80 2809 0.89 2906 0.98 3092 1.17 3272 1.36 1950 1741 2381 0.47 2478 0.55 2572 0.64 2663 0.73 2753 0.82 2842 0.91 2932 1.01 3023 1.10 3201 1.30 3372 1.51 2100 1875 2549 0.57 2640 0.66 2728 0.75 2814 0.84 2898 0.94 2981 1.04 3064 1.14 3148 1.25 3316 1.46 3480 1.67 2250 2009 2719 0.68 2803 0.78 2887 0.88 2968 0.98 3047 1.08 3125 1.19 3203 1.29 3280 1.40 3437 1.62 3594 1.85 2400 2143 2889 0.81 2969 0.92 3047 1.02 3124 1.13 3199 1.24 3273 1.35 3346 1.46 3419 1.57 3565 1.81 3712 2.05 2550 2277 3060 0.96 3135 1.07 3209 1.18 3282 1.29 3354 1.41 3424 1.52 3493 1.64 3562 1.76 3699 2.01 3837 2.26 2700 2411 3231 1.13 3302 1.24 3373 1.36 3442 1.48 3510 1.60 3577 1.72 3643 1.84 3709 1.97 3838 2.22 3967 2.49 2850 2545 3403 1.32 3471 1.44 3537 1.56 3603 1.68 3668 1.80 3733 1.93 3796 2.06 3858 2.19 3981 2.46 4104 2.74 3000 2679 3575 1.52 3639 1.65 3703 1.77 3766 1.90 3828 2.03 3890 2.17 3950 2.30 4010 2.44 4128 2.72 4244 3.00 3150 2812 3748 1.75 3809 1.88 3870 2.01 3930 2.15 3989 2.28 4048 2.42 4107 2.56 4164 2.70 4277 2.99 4388 3.29 3300 2946 3920 2.00 3979 2.13 4037 2.27 4095 2.41 4152 2.56 4208 2.70 4264 2.85 4320 2.99 4429 3.30 3450 3080 4093 2.27 4149 2.41 4205 2.56 4260 2.70 4315 2.85 4369 3.00 4423 3.15 4477 3.31 3600 3214 4266 2.56 4320 2.71 4374 2.86 4427 3.02 4479 3.17 Performance shown is for installation Type B & D: Free or ducted inlet, ducted outlet. Power rating (BHP) does not include belt drive losses. Performance ratings do not include the effects of appurtenances in the airstream. Underlined figures indicate maximum static efficiency. TCF&B Bulletin 315 5

Performance Data BAB 111 Wheel Dia.: 11.02 in. Tip Speed (FPM) = 2.89 x RPM Outlet Area: 1.40 sq. ft. Max. BHP = 0.075 (RPM 1000) 3 0.25" SP 0.5" SP 0.75" SP 1" SP 1.25" SP 1.5" SP 1.75" SP 2" SP 2.5" SP 3" SP 1000 714 1014 0.08 1204 0.13 1363 0.18 1506 0.24 1643 0.30 1200 857 1137 0.10 1313 0.16 1461 0.22 1595 0.29 1718 0.36 1835 0.43 1950 0.51 1400 1000 1268 0.14 1426 0.21 1570 0.28 1695 0.35 1811 0.42 1920 0.50 2024 0.58 2124 0.67 2320 0.85 1600 1143 1404 0.19 1546 0.26 1681 0.34 1804 0.42 1914 0.50 2017 0.59 2116 0.67 2210 0.76 2389 0.96 2562 1.16 1800 1286 1543 0.25 1674 0.33 1797 0.42 1915 0.51 2023 0.60 2122 0.69 2215 0.78 2305 0.87 2476 1.07 2636 1.29 2000 1429 1686 0.32 1806 0.41 1919 0.50 2028 0.60 2134 0.70 2231 0.80 2322 0.90 2408 1.00 2571 1.21 2725 1.43 2200 1571 1830 0.40 1942 0.50 2047 0.60 2148 0.71 2247 0.82 2342 0.93 2432 1.04 2516 1.15 2673 1.37 2821 1.60 2400 1714 1976 0.50 2081 0.61 2179 0.72 2273 0.83 2365 0.95 2456 1.07 2543 1.19 2627 1.31 2781 1.55 2923 1.79 2600 1857 2123 0.62 2221 0.73 2314 0.85 2403 0.97 2489 1.10 2573 1.22 2657 1.35 2738 1.48 2891 1.74 3030 2.00 2800 2000 2271 0.75 2363 0.87 2452 1.00 2536 1.13 2617 1.26 2696 1.40 2775 1.53 2852 1.67 3001 1.95 3140 2.24 3000 2143 2420 0.90 2507 1.03 2591 1.17 2671 1.31 2748 1.45 2823 1.59 2897 1.73 2970 1.88 3114 2.18 3251 2.48 3200 2286 2570 1.08 2652 1.22 2731 1.36 2808 1.51 2882 1.65 2953 1.80 3024 1.96 3093 2.11 3229 2.42 3362 2.74 3400 2429 2720 1.27 2798 1.42 2874 1.57 2947 1.73 3017 1.88 3086 2.04 3153 2.20 3219 2.36 3349 2.69 3476 3.03 3600 2571 2871 1.49 2945 1.65 3017 1.81 3087 1.97 3155 2.13 3221 2.30 3285 2.47 3348 2.64 3472 2.98 3593 3.33 3800 2714 3023 1.74 3093 1.90 3162 2.07 3228 2.24 3294 2.41 3357 2.58 3419 2.76 3479 2.93 3598 3.30 3714 3.66 4000 2857 3174 2.00 3242 2.18 3307 2.35 3371 2.53 3434 2.71 3495 2.89 3555 3.08 3613 3.26 3727 3.64 3838 4.02 4200 3000 3327 2.30 3391 2.49 3453 2.67 3515 2.85 3575 3.04 3634 3.23 3692 3.42 3748 3.62 3858 4.01 3965 4.41 4400 3143 3479 2.63 3540 2.82 3600 3.01 3659 3.20 3717 3.40 3774 3.60 3830 3.80 3885 4.00 3991 4.41 4095 4.82 4600 3286 3631 2.98 3690 3.18 3748 3.38 3805 3.59 3861 3.79 3916 4.00 3970 4.21 4022 4.41 4126 4.84 4800 3429 3784 3.37 3841 3.58 3896 3.79 3951 4.00 4005 4.21 4058 4.43 4110 4.64 4161 4.86 Wheel Dia.: 12.40 in. Tip Speed (FPM) = 3.25 x RPM BAB 121 Outlet Area: 1.75 sq. ft. Max. BHP = 0.135 (RPM 1000) 3 0.25" SP 0.5" SP 0.75" SP 1" SP 1.25" SP 1.5" SP 1.75" SP 2" SP 2.5" SP 3" SP 1250 710 895 0.09 1064 0.16 1206 0.22 1334 0.30 1457 0.38 1500 852 1002 0.13 1160 0.20 1292 0.28 1411 0.36 1521 0.45 1626 0.54 1728 0.64 1750 994 1116 0.17 1258 0.26 1387 0.35 1498 0.43 1602 0.53 1699 0.63 1792 0.73 1882 0.84 2000 1136 1235 0.23 1363 0.33 1484 0.43 1593 0.53 1691 0.63 1783 0.73 1872 0.84 1956 0.95 2116 1.20 2271 1.45 2250 1278 1357 0.30 1474 0.41 1585 0.52 1690 0.63 1786 0.74 1875 0.85 1958 0.97 2039 1.09 2191 1.34 2334 1.61 2500 1420 1482 0.39 1590 0.50 1691 0.62 1790 0.75 1883 0.87 1971 1.00 2051 1.12 2128 1.25 2274 1.51 2411 1.79 2750 1563 1608 0.49 1709 0.62 1803 0.74 1894 0.88 1983 1.01 2068 1.15 2148 1.29 2223 1.43 2363 1.70 2495 1.99 3000 1705 1736 0.61 1830 0.75 1919 0.89 2003 1.03 2086 1.17 2167 1.32 2245 1.47 2319 1.62 2456 1.92 2583 2.22 3250 1847 1865 0.75 1953 0.90 2037 1.05 2116 1.20 2193 1.35 2269 1.51 2344 1.67 2417 1.84 2553 2.17 2677 2.49 3500 1989 1995 0.92 2078 1.07 2157 1.23 2232 1.39 2305 1.56 2376 1.73 2447 1.90 2516 2.07 2650 2.42 2773 2.78 3750 2131 2125 1.10 2204 1.27 2279 1.44 2350 1.61 2420 1.79 2487 1.96 2554 2.14 2619 2.33 2748 2.70 2870 3.08 4000 2273 2257 1.32 2331 1.49 2402 1.67 2470 1.85 2537 2.04 2601 2.23 2664 2.42 2726 2.61 2849 3.00 2968 3.41 4250 2415 2389 1.56 2459 1.74 2526 1.93 2592 2.12 2655 2.32 2717 2.51 2777 2.71 2836 2.92 2953 3.33 3067 3.75 4500 2557 2521 1.82 2587 2.02 2652 2.22 2715 2.42 2776 2.63 2835 2.83 2892 3.04 2949 3.26 3060 3.69 3169 4.13 4750 2699 2654 2.12 2717 2.33 2779 2.54 2839 2.75 2897 2.96 2954 3.18 3009 3.40 3064 3.62 3170 4.07 3274 4.53 5000 2841 2787 2.45 2847 2.67 2906 2.89 2963 3.11 3020 3.33 3075 3.56 3128 3.79 3180 4.02 3283 4.49 3383 4.97 5250 2983 2920 2.81 2978 3.04 3034 3.27 3089 3.50 3143 3.73 3196 3.97 3248 4.21 3299 4.46 3397 4.95 3494 5.45 5500 3125 3054 3.21 3109 3.45 3163 3.69 3216 3.93 3268 4.18 3319 4.42 3369 4.67 3418 4.92 3514 5.44 5750 3267 3188 3.65 3241 3.89 3293 4.15 3344 4.40 3394 4.65 3443 4.91 3491 5.17 3539 5.43 6000 3409 3322 4.12 3372 4.37 3422 4.64 3472 4.90 3520 5.17 3568 5.44 Performance shown is for installation Type B & D: Free or ducted inlet, ducted outlet. Power rating (BHP) does not include belt drive losses. Performance ratings do not include the effects of appurtenances in the airstream. Underlined figures indicate maximum static efficiency. 6 TCF&B Bulletin 315

Performance Data Wheel Dia.: 13.98 in. Tip Speed (FPM) = 3.66 x RPM BAB 141 Outlet Area: 2.21 sq. ft. Max. BHP = 0.243 (RPM 1000) 3 BH 2600 1176 1167 0.38 1360 0.61 1537 0.86 1699 1.13 1850 1.42 3000 1357 1289 0.50 1460 0.76 1623 1.03 1775 1.33 1917 1.64 2050 1.96 3400 1538 1416 0.65 1569 0.93 1718 1.23 1859 1.54 1994 1.88 2121 2.23 2357 2.96 3800 1719 1547 0.83 1687 1.15 1821 1.47 1953 1.80 2078 2.16 2199 2.53 2426 3.32 2635 4.14 4200 1900 1681 1.05 1809 1.39 1932 1.74 2054 2.11 2172 2.48 2285 2.87 2502 3.71 2703 4.58 2892 5.49 4600 2081 1817 1.30 1936 1.67 2049 2.06 2161 2.45 2271 2.85 2379 3.26 2584 4.13 2778 5.06 2961 6.02 3134 7.01 5000 2262 1955 1.60 2065 2.00 2171 2.41 2275 2.84 2377 3.26 2478 3.70 2673 4.60 2859 5.58 3036 6.59 5400 2443 2094 1.95 2197 2.38 2296 2.82 2393 3.27 2488 3.72 2583 4.19 2768 5.13 2945 6.14 3115 7.20 5800 2624 2234 2.34 2331 2.80 2424 3.27 2515 3.75 2605 4.24 2693 4.73 2868 5.73 3037 6.77 6200 2805 2375 2.79 2466 3.28 2554 3.78 2640 4.28 2725 4.80 2808 5.33 2973 6.39 3135 7.47 6600 2986 2517 3.30 2603 3.82 2686 4.34 2768 4.88 2848 5.43 2927 5.98 3082 7.10 7000 3167 2660 3.87 2740 4.41 2820 4.98 2897 5.54 2974 6.11 3049 6.70 7400 3348 2803 4.51 2879 5.08 2954 5.66 3029 6.26 3101 6.86 3173 7.47 7800 3529 2946 5.21 3019 5.82 3091 6.43 3161 7.05 8200 3710 3090 5.99 3159 6.62 3228 7.27 8600 3891 3234 6.84 BAB 161 Wheel Dia.: 15.75 in. Tip Speed (FPM) = 4.12 x RPM Outlet Area: 2.76 sq. ft. Max. BHP = 0.443 (RPM 1000) 3 BH 3000 1083 973 0.41 1157 0.68 1323 0.98 1472 1.31 3500 1264 1076 0.54 1239 0.84 1392 1.17 1532 1.53 1662 1.90 4000 1444 1184 0.70 1330 1.04 1469 1.39 1601 1.78 1725 2.19 1840 2.61 4500 1625 1297 0.90 1428 1.28 1555 1.66 1677 2.07 1794 2.51 1905 2.97 2111 3.92 5000 1805 1412 1.14 1532 1.55 1648 1.98 1761 2.41 1870 2.87 1975 3.36 2174 4.38 2356 5.44 5500 1986 1529 1.43 1640 1.88 1746 2.34 1851 2.81 1954 3.29 2052 3.79 2241 4.87 2418 6.01 2584 7.18 6000 2166 1649 1.77 1751 2.25 1850 2.75 1947 3.26 2042 3.77 2136 4.30 2315 5.42 2485 6.62 2646 7.87 2798 9.14 6500 2347 1769 2.15 1865 2.67 1957 3.21 2047 3.75 2136 4.31 2224 4.87 2394 6.03 2557 7.29 2712 8.59 2861 9.95 7000 2527 1891 2.60 1980 3.16 2067 3.73 2151 4.31 2234 4.90 2317 5.50 2479 6.73 2634 8.01 2783 9.38 7500 2708 2013 3.11 2097 3.71 2179 4.31 2259 4.93 2337 5.56 2414 6.20 2567 7.49 2716 8.82 8000 2888 2136 3.69 2216 4.33 2293 4.97 2368 5.62 2442 6.28 2515 6.96 2659 8.32 2801 9.71 8500 3069 2260 4.34 2335 5.01 2408 5.69 2480 6.38 2550 7.08 2619 7.79 2756 9.24 9000 3249 2385 5.08 2455 5.77 2525 6.49 2593 7.22 2660 7.95 2726 8.70 9500 3430 2509 5.88 2577 6.63 2643 7.38 2708 8.14 2772 8.91 2835 9.69 10000 3610 2634 6.78 2699 7.56 2762 8.35 2824 9.14 2885 9.95 10500 3791 2760 7.77 2821 8.58 2881 9.40 11000 3971 2886 8.85 2944 9.70 Performance shown is for installation Type B & D: Free or ducted inlet, ducted outlet. Power rating (BHP) does not include belt drive losses. Performance ratings do not include the effects of appurtenances in the airstream. Underlined figures indicate maximum static efficiency. TCF&B Bulletin 315 7

Performance Data Wheel Dia.: 17.72 in. Tip Speed (FPM) = 4.64 x RPM BAB 181 Outlet Area: 3.48 sq. ft. Max. BHP = 0.798 (RPM 1000) 3 4500 1293 966 0.70 1110 1.09 1244 1.51 1368 1.97 1483 2.45 5000 1437 1043 0.87 1174 1.29 1299 1.74 1416 2.22 1527 2.74 1630 3.26 5500 1580 1121 1.06 1241 1.52 1358 1.99 1469 2.50 1575 3.05 1675 3.61 1860 4.79 6000 1724 1201 1.28 1313 1.78 1421 2.29 1526 2.82 1626 3.39 1722 3.98 1902 5.23 2069 6.54 6500 1868 1283 1.54 1387 2.07 1488 2.62 1587 3.19 1682 3.77 1774 4.39 1948 5.71 2108 7.07 2261 8.51 7000 2011 1366 1.83 1464 2.40 1558 2.99 1650 3.59 1741 4.20 1829 4.84 1996 6.21 2153 7.65 2300 9.15 2441 10.70 7500 2155 1449 2.16 1542 2.77 1630 3.39 1717 4.03 1803 4.68 1887 5.34 2047 6.75 2200 8.27 2343 9.82 2479 11.43 8000 2299 1534 2.54 1621 3.18 1705 3.84 1787 4.52 1868 5.20 1948 5.89 2102 7.35 2249 8.91 2389 10.54 2522 12.22 8500 2443 1619 2.96 1701 3.64 1781 4.33 1859 5.04 1936 5.77 2012 6.50 2160 8.00 2301 9.60 2437 11.29 2568 13.05 9000 2586 1704 3.43 1783 4.14 1859 4.88 1933 5.62 2006 6.38 2078 7.15 2220 8.71 2357 10.36 2488 12.10 2615 13.91 9500 2730 1791 3.95 1865 4.70 1938 5.47 2009 6.25 2078 7.05 2147 7.86 2282 9.48 2414 11.17 2542 12.97 2665 14.83 10000 2874 1877 4.52 1948 5.31 2018 6.12 2085 6.93 2152 7.76 2217 8.60 2347 10.32 2474 12.06 2598 13.89 10500 3017 1964 5.15 2032 5.98 2098 6.81 2163 7.67 2227 8.54 2290 9.42 2414 11.21 2536 13.01 2656 14.88 11000 3161 2051 5.84 2116 6.70 2180 7.58 2242 8.46 2304 9.37 2364 10.29 2483 12.15 2601 14.05 11500 3305 2138 6.59 2201 7.49 2262 8.40 2322 9.32 2381 10.26 2439 11.21 2554 13.16 12000 3448 2226 7.41 2286 8.34 2345 9.29 2403 10.25 2460 11.23 2516 12.22 2626 14.22 13000 3736 2402 9.24 2457 10.25 2512 11.27 2566 12.31 2619 13.35 2672 14.42 14000 4023 2578 11.37 2630 12.45 2681 13.55 2731 14.65 15000 4310 2755 13.81 2804 14.98 BAB 201 Wheel Dia.: 19.68 in. Tip Speed (FPM) = 5.15 x RPM Outlet Area: 4.38 sq. ft. Max. BHP = 1.334 (RPM 1000) 3 5500 1256 850 0.81 985 1.28 1104 1.76 1212 2.29 1313 2.87 6250 1427 932 1.04 1049 1.57 1166 2.10 1267 2.66 1362 3.26 1452 3.91 7000 1598 1017 1.32 1121 1.90 1228 2.49 1328 3.10 1417 3.72 1503 4.40 1664 5.85 7750 1769 1104 1.65 1199 2.28 1293 2.94 1390 3.59 1478 4.27 1559 4.97 1712 6.46 1855 8.10 8500 1941 1193 2.05 1280 2.72 1365 3.44 1453 4.15 1541 4.88 1620 5.62 1766 7.18 1903 8.85 2033 10.66 9250 2112 1283 2.51 1364 3.23 1442 3.99 1521 4.78 1603 5.56 1683 6.35 1825 7.99 1955 9.71 2081 11.57 2200 13.53 10000 2283 1374 3.04 1450 3.82 1523 4.63 1595 5.47 1669 6.31 1745 7.16 1886 8.88 2012 10.67 2132 12.57 2248 14.58 10750 2454 1466 3.65 1537 4.48 1606 5.34 1673 6.23 1740 7.13 1810 8.05 1948 9.86 2073 11.75 2188 13.70 11500 2626 1559 4.35 1626 5.23 1691 6.14 1754 7.08 1816 8.03 1879 9.00 2011 10.95 2136 12.94 2249 14.98 12250 2797 1652 5.13 1715 6.06 1776 7.01 1836 8.00 1895 9.02 1954 10.05 2075 12.11 2198 14.20 13000 2968 1746 6.02 1805 6.99 1863 8.00 1920 9.03 1976 10.10 2031 11.17 2143 13.36 13750 3139 1840 7.00 1896 8.03 1951 9.08 2006 10.17 2059 11.28 2111 12.41 2216 14.72 14500 3311 1934 8.09 1987 9.16 2040 10.27 2092 11.40 2143 12.56 2193 13.75 15250 3482 2028 9.28 2079 10.41 2130 11.58 2180 12.77 2229 13.98 16000 3653 2123 10.60 2172 11.79 2220 13.00 2268 14.24 16750 3824 2218 12.05 2265 13.29 2311 14.55 17500 3995 2313 13.62 2358 14.91 Performance shown is for installation Type B & D: Free or ducted inlet, ducted outlet. Power rating (BHP) does not include belt drive losses. Performance ratings do not include the effects of appurtenances in the airstream. Underlined figures indicate maximum static efficiency. 8 TCF&B Bulletin 315

Performance Data BAB 221 Wheel Dia.: 22.05 in. Tip Speed (FPM) = 5.77 x RPM Outlet Area: 5.50 sq. ft. Max. BHP = 2.36 (RPM 1000) 3 6000 1091 692 0.79 825 1.31 938 1.88 1041 2.51 7000 1273 766 1.05 884 1.64 991 2.26 1086 2.92 1176 3.65 8000 1455 844 1.36 946 2.03 1049 2.71 1139 3.42 1223 4.18 1303 5.00 9000 1636 925 1.74 1015 2.48 1108 3.24 1198 4.02 1277 4.83 1352 5.67 1494 7.51 10000 1818 1008 2.21 1091 3.02 1172 3.86 1257 4.71 1335 5.57 1407 6.46 1541 8.35 1668 10.44 11000 2000 1093 2.77 1169 3.64 1242 4.55 1318 5.48 1394 6.41 1466 7.37 1594 9.35 1714 11.46 1829 13.77 1940 16.20 12000 2182 1179 3.42 1249 4.35 1317 5.34 1384 6.34 1454 7.35 1524 8.37 1651 10.48 1766 12.68 1876 15.02 1981 17.52 13000 2364 1265 4.17 1331 5.18 1394 6.22 1456 7.30 1519 8.40 1584 9.49 1710 11.73 1822 14.04 1926 16.43 2028 18.98 14000 2545 1353 5.04 1414 6.11 1474 7.23 1531 8.37 1589 9.55 1648 10.73 1769 13.10 1880 15.53 1982 18.05 15000 2727 1441 6.04 1498 7.17 1555 8.36 1609 9.57 1663 10.82 1717 12.08 1829 14.61 1939 17.15 2040 19.80 16000 2909 1530 7.17 1584 8.38 1637 9.62 1688 10.88 1739 12.20 1789 13.53 1892 16.24 1998 18.94 17000 3091 1619 8.43 1670 9.71 1720 11.02 1769 12.36 1817 13.73 1864 15.13 1959 17.98 18000 3273 1708 9.85 1756 11.19 1804 12.57 1851 13.98 1897 15.43 1942 16.90 2031 19.89 19000 3455 1797 11.41 1843 12.82 1889 14.29 1933 15.75 1977 17.25 2020 18.78 20000 3636 1887 13.15 1931 14.64 1974 16.15 2017 17.70 2059 19.27 21000 3818 1977 15.06 2019 16.63 2060 18.20 2101 19.82 22000 4000 2068 17.18 2107 18.78 23000 4182 2158 19.46 BAB 251 Wheel Dia.: 24.80 in. Tip Speed (FPM) = 6.49 x RPM Outlet Area: 6.90 sq. ft. Max. BHP = 4.44 (RPM 1000) 3 9000 1302 684 1.36 774 2.09 860 2.84 945 3.61 10000 1447 740 1.69 822 2.48 901 3.30 979 4.15 1055 5.02 11000 1592 798 2.07 874 2.93 947 3.83 1017 4.74 1088 5.68 1157 6.63 12000 1737 856 2.51 927 3.44 995 4.40 1061 5.39 1125 6.40 1190 7.42 1314 9.54 13000 1881 916 3.03 982 4.02 1045 5.04 1107 6.10 1167 7.18 1227 8.29 1345 10.49 14000 2026 976 3.62 1038 4.67 1098 5.77 1156 6.89 1213 8.05 1268 9.20 1379 11.58 1487 14.00 15000 2171 1037 4.29 1096 5.41 1152 6.57 1207 7.77 1260 8.97 1313 10.22 1416 12.73 1519 15.27 1619 17.95 16000 2315 1099 5.05 1154 6.23 1207 7.45 1259 8.72 1310 10.00 1360 11.31 1457 13.96 1554 16.67 1650 19.40 1742 22.28 17000 2460 1161 5.90 1213 7.15 1264 8.45 1313 9.77 1361 11.11 1408 12.47 1501 15.27 1593 18.17 1684 21.03 1773 23.94 18000 2605 1223 6.84 1272 8.15 1321 9.52 1368 10.91 1413 12.31 1459 13.77 1547 16.68 1634 19.69 1720 22.74 19000 2750 1285 7.88 1333 9.28 1379 10.71 1423 12.14 1467 13.62 1510 15.12 1595 18.20 1678 21.34 1760 24.55 20000 2894 1348 9.04 1393 10.50 1437 11.99 1480 13.51 1522 15.05 1563 16.61 1645 19.84 1724 23.09 21000 3039 1411 10.31 1454 11.84 1496 13.39 1537 14.97 1578 16.60 1617 18.21 1695 21.55 1772 24.98 22000 3184 1474 11.69 1515 13.29 1556 14.93 1595 16.56 1634 18.24 1672 19.94 1747 23.41 23000 3329 1538 13.23 1577 14.88 1616 16.58 1654 18.29 1691 20.02 1728 21.80 24000 3473 1601 14.86 1639 16.60 1676 18.35 1713 20.14 1749 21.95 1785 23.80 25000 3618 1665 16.66 1701 18.45 1737 20.28 1772 22.12 1807 24.00 26000 3763 1728 18.56 1763 20.43 1798 22.34 1832 24.25 27000 3907 1792 20.65 1826 22.59 1859 24.54 Performance shown is for installation Type B & D: Free or ducted inlet, ducted outlet. Power rating (BHP) does not include belt drive losses. Performance ratings do not include the effects of appurtenances in the airstream. Underlined figures indicate maximum static efficiency. TCF&B Bulletin 315 9

Performance Data BAB 281 Wheel Dia.: 27.95 in. Tip Speed (FPM) = 7.32 x RPM Outlet Area: 8.67 sq. ft. Max. BHP = 8.07 (RPM 1000) 3 12000 1382 643 1.98 717 2.93 788 3.91 857 4.93 925 6.00 991 7.19 13250 1526 694 2.43 762 3.46 828 4.54 891 5.63 954 6.78 1016 7.98 14500 1671 747 2.97 810 4.09 871 5.25 930 6.44 987 7.64 1045 8.90 1157 11.59 15750 1815 801 3.59 859 4.79 916 6.05 971 7.31 1025 8.61 1078 9.94 1183 12.70 1284 15.71 17000 1959 855 4.30 910 5.60 963 6.93 1014 8.28 1065 9.66 1115 11.08 1213 13.98 1309 17.03 1402 20.37 18250 2103 910 5.12 961 6.49 1011 7.91 1060 9.36 1108 10.84 1154 12.30 1247 15.39 1338 18.57 1426 21.88 1512 25.51 19500 2247 966 6.05 1014 7.51 1061 9.00 1107 10.54 1152 12.10 1196 13.66 1283 16.87 1369 20.21 1454 23.66 1536 27.25 20750 2391 1022 7.10 1067 8.62 1111 10.19 1155 11.83 1198 13.48 1240 15.14 1322 18.49 1403 21.97 1484 25.58 1563 29.26 22000 2535 1078 8.25 1121 9.88 1163 11.54 1204 13.23 1245 14.97 1285 16.72 1364 20.29 1441 23.91 1517 27.65 23250 2679 1134 9.53 1175 11.25 1215 12.99 1254 14.76 1293 16.58 1331 18.42 1407 22.19 1480 25.94 1553 29.86 24500 2823 1191 10.97 1230 12.77 1268 14.59 1306 16.47 1343 18.37 1379 20.28 1451 24.20 1521 28.13 25750 2967 1248 12.54 1285 14.42 1321 16.32 1357 18.27 1393 20.28 1428 22.29 1497 26.39 27000 3111 1305 14.27 1340 16.22 1375 18.22 1410 20.28 1444 22.34 1477 24.41 1543 28.66 28250 3255 1362 16.14 1396 18.20 1429 20.26 1462 22.37 1495 24.54 1527 26.70 29500 3399 1420 18.21 1452 20.33 1484 22.50 1516 24.71 1547 26.92 1578 29.17 30750 3543 1477 20.42 1508 22.63 1539 24.89 1569 27.15 1600 29.50 32000 3687 1535 22.84 1565 25.15 1594 27.46 1624 29.86 33250 3831 1592 25.40 1621 27.80 34500 3975 1650 28.20 BAB 321 Wheel Dia.: 31.50 in. Tip Speed (FPM) = 8.51 x RPM Outlet Area: 10.92 sq. ft. Max. BHP = 14.68 (RPM 1000) 3 16000 1468 592 2.77 655 4.03 715 5.32 775 6.69 833 8.09 889 10.00 17500 1606 636 3.37 694 4.72 750 6.13 805 7.58 859 9.08 912 10.61 1014 13.98 19000 1743 680 4.04 735 5.52 787 7.02 838 8.56 888 10.15 938 11.80 1035 15.23 20500 1881 726 4.84 776 6.39 825 8.00 873 9.65 920 11.33 966 13.04 1058 16.64 1146 20.46 22000 2018 771 5.72 819 7.39 865 9.10 910 10.85 954 12.62 998 14.45 1084 18.22 1168 22.12 1249 26.33 23500 2156 818 6.74 862 8.48 906 10.31 949 12.19 991 14.09 1032 15.99 1112 19.88 1192 23.96 1270 28.22 1346 32.85 25000 2294 864 7.86 907 9.75 948 11.65 988 13.60 1028 15.61 1067 17.63 1143 21.70 1219 25.99 1294 30.40 1367 35.03 26500 2431 911 9.13 951 11.09 990 13.10 1029 15.19 1066 17.25 1104 19.42 1177 23.73 1248 28.13 1319 32.69 1389 37.40 28000 2569 958 10.53 996 12.59 1034 14.74 1070 16.87 1106 19.08 1142 21.34 1211 25.81 1279 30.40 1347 35.20 29500 2706 1006 12.10 1042 14.26 1077 16.45 1112 18.72 1147 21.05 1181 23.40 1247 28.09 1313 32.94 1377 37.84 31000 2844 1053 13.79 1088 16.08 1122 18.40 1155 20.74 1188 23.14 1220 25.55 1285 30.58 1347 35.54 32500 2982 1101 15.67 1134 18.04 1166 20.43 1198 22.89 1230 25.42 1261 27.94 1323 33.15 1383 38.36 34000 3119 1149 17.72 1180 20.16 1211 22.67 1242 25.24 1272 27.82 1302 30.46 1362 35.90 35500 3257 1197 19.94 1227 22.50 1257 25.13 1286 27.75 1316 30.50 1344 33.18 1401 38.76 37000 3394 1245 22.35 1274 25.02 1302 27.69 1331 30.49 1359 33.28 1387 36.12 38500 3532 1293 24.94 1321 27.72 1348 30.50 1376 33.40 1403 36.28 1430 39.23 40000 3670 1341 27.73 1368 30.61 1395 33.56 1421 36.49 1447 39.47 41500 3807 1389 30.72 1415 33.70 1441 36.74 1467 39.84 43000 3945 1438 33.99 1463 37.08 44500 4083 1486 37.42 Performance shown is for installation Type B & D: Free or ducted inlet, ducted outlet. Power rating (BHP) does not include belt drive losses. Performance ratings do not include the effects of appurtenances in the airstream. Underlined figures indicate maximum static efficiency. 10 TCF&B Bulletin 315

Performance Data Wheel Dia.: 35.43 in. Tip Speed (FPM) = 9.28 x RPM BAB 351 Outlet Area: 13.84 sq. ft. Max. BHP = 25.3 (RPM 1000) 3 20000 1446 524 3.39 583 4.96 643 6.67 698 8.39 748 10.08 799 11.96 22000 1591 566 4.19 619 5.86 673 7.68 727 9.60 775 11.45 821 13.34 24000 1735 608 5.11 657 6.90 705 8.79 756 10.87 804 12.95 848 14.98 931 19.15 26000 1880 650 6.15 696 8.08 741 10.11 786 12.22 833 14.51 876 16.73 955 21.11 1033 25.91 28000 2025 693 7.36 736 9.41 778 11.56 819 13.77 863 16.18 905 18.58 983 23.39 1055 28.19 1127 33.47 30000 2169 737 8.75 777 10.92 816 13.17 855 15.53 894 17.96 935 20.57 1011 25.72 1081 30.84 1147 36.01 1215 41.83 32000 2314 781 10.32 818 12.58 855 14.96 892 17.46 928 19.98 966 22.69 1040 28.18 1109 33.71 1172 39.07 1235 44.80 34000 2458 825 12.06 861 14.50 895 16.96 930 19.57 964 22.22 999 25.00 1070 30.81 1138 36.73 1199 42.37 1259 48.23 36000 2603 870 14.04 903 16.55 936 19.17 969 21.89 1001 24.64 1033 27.47 1100 33.51 1166 39.73 1228 45.96 38000 2748 915 16.23 946 18.85 977 21.57 1008 24.38 1039 27.29 1070 30.29 1132 36.46 1196 43.02 1257 49.61 40000 2892 959 18.58 989 21.36 1019 24.23 1049 27.20 1078 30.18 1107 33.25 1166 39.68 1226 46.40 42000 3037 1004 21.21 1033 24.14 1062 27.17 1090 30.21 1118 33.34 1146 36.56 1201 43.11 44000 3181 1050 24.16 1077 27.17 1104 30.26 1131 33.44 1158 36.71 1185 40.06 1238 46.89 46000 3326 1095 27.29 1121 30.44 1147 33.67 1173 36.99 1199 40.38 1224 43.76 48000 3471 1140 30.69 1165 33.97 1190 37.33 1215 40.77 1240 44.29 1265 47.89 50000 3615 1186 34.45 1210 37.86 1234 41.34 1258 44.91 1282 48.55 52000 3760 1231 38.41 1254 41.94 1278 45.64 1301 49.32 54000 3905 1277 42.77 1299 46.41 56000 4049 1323 47.45 BAB 391 Wheel Dia.: 39.37 in. Tip Speed (FPM) = 10.31 x RPM Outlet Area: 17.28 sq. ft. Max. BHP = 42.8 (RPM 1000) 3 25000 1447 476 4.29 528 6.23 582 8.39 631 10.52 676 12.64 721 14.95 27500 1591 514 5.31 561 7.38 609 9.63 657 12.02 701 14.38 742 16.73 30000 1736 552 6.46 596 8.71 639 11.07 684 13.64 727 16.24 766 18.75 841 24.00 32500 1881 591 7.82 632 10.22 672 12.75 712 15.39 754 18.24 793 21.06 864 26.56 932 32.36 35000 2025 631 9.39 669 11.95 706 14.61 743 17.39 781 20.32 819 23.35 889 29.37 953 35.32 1017 41.83 37500 2170 671 11.17 706 13.85 741 16.67 775 19.56 810 22.62 846 25.83 915 32.35 977 38.67 1036 45.11 1096 52.22 40000 2315 711 13.17 744 16.00 777 18.98 809 22.02 841 25.16 875 28.55 941 35.40 1003 42.33 1060 49.10 1115 56.05 42500 2459 751 15.39 782 18.37 813 21.48 844 24.73 874 28.00 905 31.46 968 38.67 1029 46.07 1085 53.32 45000 2604 792 17.92 821 21.03 851 24.35 880 27.72 908 31.10 937 34.67 996 42.14 1056 50.05 1111 57.76 47500 2749 832 20.64 861 24.03 888 27.37 916 30.92 943 34.49 971 38.27 1026 45.96 1082 54.00 50000 2894 873 23.72 900 27.21 927 30.83 953 34.46 979 38.21 1005 42.06 1057 50.02 1110 58.34 52500 3038 914 27.08 940 30.76 965 34.46 990 38.26 1015 42.17 1040 46.19 1089 54.35 55000 3183 956 30.86 980 34.62 1004 38.48 1028 42.44 1052 46.51 1076 50.69 1123 59.18 57500 3328 997 34.86 1020 38.78 1043 42.80 1066 46.92 1089 51.13 1112 55.45 60000 3472 1038 39.21 1061 43.40 1083 47.57 1105 51.84 1127 56.20 62500 3617 1080 44.03 1101 48.25 1122 52.55 1144 57.09 65000 3762 1121 49.10 1142 53.58 1162 58.02 67500 3906 1163 54.69 1183 59.31 Performance shown is for installation Type B & D: Free or ducted inlet, ducted outlet. Power rating (BHP) does not include belt drive losses. Performance ratings do not include the effects of appurtenances in the airstream. Underlined figures indicate maximum static efficiency. TCF&B Bulletin 315 11

TWIN CITY FAN & BLOWER MINNEAPOLIS, MINNESOTA 55442 DIMENSIONS ARE NOT TO BE USED FOR CONSTRUCTION. CERTIFIED DRAWINGS AVAILABLE UPON REQUEST. 12 TCF&B Bulletin 315

TWIN CITY FAN & BLOWER MINNEAPOLIS, MINNESOTA 55442 DIMENSIONS ARE NOT TO BE USED FOR CONSTRUCTION. CERTIFIED DRAWINGS AVAILABLE UPON REQUEST. TCF&B Bulletin 315 13

Typical Specifications Fans shall be Type BAB backward inclined fans, as manufactured by Twin City Fan & Blower, Minneapolis, Minnesota. Fan performance shall be based on tests conducted in accordance with the AMCA Standard test code for air moving devices and shall be licensed to bear the AMCA Certified Rating Seal for both Sound and Air. Fans shall have a sharply rising pressure characteristic extending through the operating range and continuing to rise beyond the peak efficiency to ensure quiet and stable operation. Fans shall have non-overloading design with self-limiting horsepower characteristics and shall reach a peak in the normal selection area. FAN HOUSING BAB fan housings through size 351 shall be of galvanized lock seam construction. The housing for size 391 fans shall be continuously welded steel construction. Housings shall be suitably braced to minimize vibration or pulsation. Fan housings shall have spun, aerodynamically designed inlet cones or inlet venturies for smooth airflow into the wheels. Support frames shall be designed for universal mounting, rotatable to any of the four standard discharge positions. WHEELS All fan wheels shall have wheel cones or shrouds, providing stable flow and high rigidity. Wheels shall be of the non-overloading type. BAB backward inclined wheels shall be single thickness plate type, continuously welded to the rim and back plate. Blades shall be designed for maximum efficiency and quiet operation. All BAB wheels shall be statically and dynamically balanced. The complete fan assembly shall be test balanced at the operating speed prior to shipment. SHAFTS BAB shafts shall be manufactured of AISI 1040 or 1045 cold rolled steel, accurately turned, ground, polished, and ring gauged for accuracy. Drive extensions shall be provided at both ends for mounting flexibility. BEARINGS Bearings shall be pillow block, heavy-duty, anti-friction, self-aligning, grease lubricated, ball or roller type. Each fan s bearings shall be sized with a minimum average life, per AFBMA, in excess of 200,000 hours when operating at the maximum RPM. FINISH AND COATING BAB fans through size 351 shall have galvanized housings and bearing supports. Housings for size 391 and wheels for all sizes shall be thoroughly degreased and deburred before the application of a rust preventive primer. After assembly, a finish coat of enamel shall be applied to the entire unit. All shafts shall be coated with a petroleum based protective coating. ACCESSORIES When specified, fans shall be supplied with internal or nested type variable inlet vanes. Double width fans shall have interconnecting linkage to ensure operation in unison. Other accessories such as drain connections, access doors, discharge flanges, inlet screens, extended lube lines and belt guards shall be provided by Twin City Fan & Blower when specified. FACTORY RUN TEST All fans prior to shipment shall be completely assembled and test run as a unit at operating speed or maximum RPM allowed for the particular construction type. Each wheel shall be statically and dynamically balanced in accordance with ANSI/AMCA 204-96 Balance Quality and Vibration Levels for Fans to Fan Application Category BV-3, Balance Quality Grade G6.3. Balance readings shall be taken by electronic type equipment in the axial, vertical, and horizontal directions on each of the bearings. Records shall be maintained and a written copy shall be available upon request. SUBMITTALS Submittals for approval of equipment shall include copies of outline drawings and performance curves showing the operating point. 14 TCF&B Bulletin 315