Centrifugal Fan Class IV - Greenheck Fan Corporation - Building ...

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Direct Drive Fan Selection Procedure 10 Most direct drive applications will have multiple fan size and RPM selections which will satisfy the design requirements. Selections can be narrowed further by RPM or horsepower restrictions, sound criteria or space restrictions. The direct drive performance graphs contain fan wheel sizes ranging from 30 to 73 inch diameters and RPMs ranging from 870 to 1770. All fan sizes and RPMs have fan performance curves in 5 percent increments from a full width wheel down to a 50% wheel width. Both static pressure vs. CFM (shown as solid lines) and brake horsepower vs. CFM (dashed lines) are depicted. Inlet and outlet sound power is shown for all fan sizes and RPMs. Tables of sound power for direct drive fans are found starting on page 32. Sound power for each selection can be determined by matching fan RPM with the system static pressure. See page 36 for complete model number code. Direct Drive Fan Selection Example Enter the performance graph with the desired CFM and Ps. Obtain the percentage wheel width and brake horsepower requirements. For this example, select 40,000 CFM at 6 inches static pressure which is shown as 'A'. The static vs CFM curve (solid line) that satisfies this point of operation has a wheel width of 85%. To determine the brake horsepower, find the intersection of the brake horsepower vs. CFM curve (dashed line) for a 85% wheel at 40000 CFM (point 'B'). Read the brake horsepower value from the right side of the table. For this selection, the brake horsepower is approximately 66. A 75 horsepower motor or larger is required. See pages 3 and 4 to find motor frame sizes and check minimum and maximum motor frame size for Arr. 4 and 8. 44 BISWD 44 BISWD Pressure Class Limits Class Max. RPM III 1392 IV 1675 Wheel Diameter 44 1/2 in. Outlet Area 11.39 ft. 2 Inlet Sound Power, Lwi Outlet Sound Power, Lwo RPM Ps 1 2 3 4 5 6 7 8 LwiA RPM Ps 1 2 3 4 5 6 7 8 LwoA 1170 2 107 113 108 101 99 97 91 85 106 1170 2 115 117 111 106 102 100 95 88 110 4 106 112 107 100 97 95 89 84 105 4 114 116 110 105 101 98 93 87 108 6 104 112 106 98 96 93 88 83 103 6 113 115 108 103 99 96 91 85 107 8 102 110 104 96 94 92 88 84 102 8 110 113 107 101 98 94 90 85 105 10 102 109 102 94 93 91 88 86 100 10 108 112 106 100 96 92 89 85 104 B x x A Sound Power [dB Ref 10 -12 watts] Determining Inlet and Outlet Sound Enter the fan sound table with the Fan RPM and static pressure. For this example, the eight octave ratings are circled in the table below. Tables for direct drive sound power levels are found starting on page 32. Note: If the static pressure is not indicated in the chart, the eight octave ratings can be interpolated. Additional Information on Performance Graph -Wheel Diameter -Outlet Area; used to calculate Outlet Velocity (OV) CFM OV= OA -Wheel class used to meet performance -Max. class wheel RPM GREENHECK ®
18 BISW Performance Data Wheel Diameter = 18 1/4 in. Outlet Area = 1.92 ft 2 Tip Speed = 4.78 x RPM Maximum BHP = (RPM/1206) 3 Pressure Class Limits 3450 Class Max. RPM III 3450 IV 4160 Static Pressure in Inches CFM OV 10 11 12 13 14 15 16 17 18 20 RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP 5700 2968 2886 12.4 2990 13.6 3090 14.9 3196 16.2 3299 17.6 3397 19.0 3493 20.4 3585 21.8 3675 23.2 6150 3203 2943 13.5 3047 14.8 3146 16.1 3242 17.4 3333 18.7 3432 20.1 3528 21.6 3620 23.1 3709 24.6 3881 27.6 6600 3437 3007 14.7 3105 16.0 3204 17.3 3298 18.7 3390 20.1 3478 21.5 3563 22.9 3655 24.4 3744 26.0 3916 29.1 7050 3671 3075 15.9 3171 17.3 3263 18.7 3356 20.1 3447 21.5 3534 23.0 3619 24.5 3702 25.9 3782 27.4 3951 30.7 7500 3906 3143 17.2 3239 18.7 3331 20.1 3419 21.6 3504 23.1 3592 24.6 3676 26.1 3758 27.7 3838 29.2 3991 32.4 7950 4140 3217 18.7 3308 20.2 3399 21.7 3487 23.2 3571 24.8 3652 26.3 3734 27.9 3816 29.5 3895 31.1 4047 34.4 8400 4375 3293 20.2 3382 21.7 3468 23.3 3555 24.9 3639 26.5 3720 28.1 3799 29.8 3874 31.4 3952 33.1 4104 36.5 8850 4609 3370 21.8 3458 23.4 3543 25.1 3626 26.7 3707 28.4 3788 30.0 3866 31.7 3942 33.4 4015 35.2 9300 4843 3449 23.5 3535 25.2 3619 26.9 3701 28.6 3779 30.3 3857 32.0 3934 33.8 4010 35.6 4083 37.4 9750 5078 3539 25.4 3614 27.1 3696 28.9 3777 30.6 3855 32.4 3931 34.2 4004 36.0 4078 37.8 10200 5312 3630 27.4 3704 29.2 3776 30.9 3854 32.8 3931 34.6 4006 36.5 4079 38.3 10650 5546 3722 29.5 3795 31.3 3866 33.2 3934 35.0 4008 36.9 4082 38.8 Performance shown is for model BISW arrangement 1, installation Type B - free inlet, ducted outlet. Performance ratings do not include the effects of appurtenances in the airstream. Power rating (BHP) does not include drive losses. Sound Power [dB Ref 10 -12 watts] INLET SOUND POWER, Lwi RPM % WOV 1 2 3 4 5 6 7 8 LwiA 2500 100 96 95 97 102 96 96 93 83 103 80 95 94 95 101 93 91 87 80 100 60 94 92 93 98 91 89 85 81 98 50 96 93 95 98 91 89 86 83 98 40 99 96 96 96 90 89 86 83 97 3450 100 102 105 105 108 106 103 101 94 111 80 101 103 103 107 104 99 96 90 108 60 100 102 101 104 101 97 94 90 106 50 102 103 102 104 101 97 95 91 106 40 105 106 105 103 100 96 94 92 105 4160 100 105 109 110 111 110 108 106 100 115 80 104 108 108 110 109 104 101 95 113 60 104 107 106 108 106 102 99 95 110 50 105 108 107 108 106 102 99 96 111 40 108 111 110 108 105 101 99 96 110 % WOV = (CFM x 100) / (RPM x 3.60) OUTLET SOUND POWER, Lwo RPM % WOV 1 2 3 4 5 6 7 8 LwoA 2500 100 107 103 101 106 99 99 96 87 106 80 106 99 97 102 97 94 90 82 103 60 104 95 96 98 94 91 86 81 99 50 104 96 96 96 93 89 85 80 98 40 108 98 96 96 92 88 85 80 98 3450 100 113 112 109 111 109 106 105 98 114 80 112 109 105 108 106 102 99 93 110 60 110 106 102 104 103 99 95 90 107 50 110 107 103 102 101 98 94 90 106 40 114 110 104 102 101 97 93 89 106 4160 100 116 116 114 115 114 111 109 104 118 80 116 114 110 111 111 107 104 99 115 60 114 111 108 108 107 105 101 96 112 50 114 112 108 106 105 103 99 95 110 40 118 115 110 107 105 102 98 94 110 The sound power level ratings shown are in decibels, referred to 10 -12 watts calculated per AMCA Standard 301. Values shown are for inlet Lwi, LwiA and outlet Lwo, LwoA sound power levels for installation Type B: free inlet, ducted outlet. Outlet ratings include the effects of duct end correction. GREENHECK ® 11
Page 1 and 2: CENTRIFUGAL FAN FAN CLASS IV CATALO
Page 3 and 4: Motor Selection Greenheck centrifug
Page 5 and 6: Effect of Air Density - Temperature
Page 7 and 8: Sound Performance Data AMCA License
Page 9: Belt Drive Fan Selection Procedure
Page 13 and 14: 22 BISW Performance Data Wheel Diam
Page 27 and 28: 33 BISWD 36 BISWD Pressure Class Li
Page 33 and 34: Direct Drive Sound Data Sound Power
Page 35 and 36: Sizes 30-49 Arrangement 4 Size Size

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