Vane Axial Fans - Greenheck

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Belt Drive Base Sound Power Levels Fan Model RPM Octave Band 1 2 3 4 5 6 7 8 Max Static Efficiency Fan Model RPM Octave Band 1 2 3 4 5 6 7 8 Max Static Efficiency VAB-48F21 400 80 81 81 78 73 66 59 52 VAB-60F26 400 82 85 84 81 76 71 66 61 700 88 93 93 93 89 84 77 70 600 87 93 93 92 88 83 78 73 1000 92 98 101 100 99 94 88 81 60 850 92 98 101 100 97 93 88 83 58 1300 96 102 107 106 106 102 96 89 1100 96 101 107 106 104 101 96 91 1600 100 104 110 111 111 108 103 96 1300 99 104 109 110 109 105 100 95 VAB-48F26 400 78 81 79 77 72 67 61 55 VAB-60F30 400 81 85 84 81 77 71 67 63 700 85 92 93 91 88 83 78 72 600 86 92 93 91 88 83 79 75 1000 91 96 102 100 98 94 89 83 63 850 91 97 102 100 97 94 88 84 62 1300 95 99 106 106 104 101 96 90 1100 96 100 106 107 104 101 96 91 1600 99 102 108 111 109 107 102 97 1300 98 103 108 110 108 105 101 96 VAB-48F30 400 75 82 79 76 72 66 61 56 VAB-66F26 350 82 84 82 79 75 70 66 62 700 84 89 93 91 88 83 77 72 550 88 94 93 92 88 83 79 75 1000 90 93 101 99 97 94 88 83 65 750 93 98 101 99 96 92 87 83 58 1300 94 97 104 106 104 101 96 90 950 96 101 106 105 103 99 94 90 1600 98 101 105 112 109 107 102 96 1150 99 104 110 110 108 104 99 95 VAB-54F21 400 83 84 84 82 76 69 61 53 VAB-66F30 350 81 84 82 79 75 71 67 63 650 91 95 94 95 91 85 77 69 550 87 93 93 91 88 83 79 75 900 94 100 102 102 100 95 88 80 60 750 92 97 100 99 96 92 87 83 62 1150 97 104 107 106 107 103 96 88 950 96 100 106 105 102 99 94 90 1400 100 106 111 111 111 108 103 95 1150 99 103 108 109 107 104 100 95 VAB-54F26 400 80 83 82 80 75 69 63 57 VAB-72F26 350 84 87 85 81 76 73 71 69 650 86 92 93 92 89 84 78 72 550 90 96 96 94 89 85 82 80 900 91 96 101 100 98 93 87 81 62 700 94 99 102 100 96 91 88 86 58 1150 95 100 106 105 104 101 95 89 850 96 102 106 105 101 97 93 91 1400 98 103 108 110 109 106 101 95 1050 100 105 110 110 107 103 98 96 VAB-54F30 400 79 84 82 80 75 70 65 60 VAB-72F30 350 84 87 84 81 77 73 69 65 650 86 92 94 92 89 84 79 74 550 91 96 96 93 89 86 82 78 900 91 96 102 100 98 94 89 84 65 700 95 99 102 99 96 92 88 84 62 1150 96 99 105 106 104 101 96 91 850 98 102 106 105 101 98 94 90 1400 99 102 108 111 109 106 102 97 1050 101 105 110 110 106 103 99 95 *See page 98 for belt drive instructions. The AMCA Certified Ratings Seal applies to air performance ratings only. ® 100
® Calculating Direct Drive Sound Power Levels To calculate sound power levels for direct drive vane axial fans, use the following formula: Lw = Lw b + Eff. Corr. + 10 Log 10 (cfm x P T2 ) Lw = Sound Power Level. Lw b = Base Sound Power Level. Eff. Corr. = Efficiency Correction Factor. 2 10 Log 10 (cfm x P T ) = Volume/Pressure Correction Factor Example: VADS-24F14-20A 1770 RPM 6,800 cfm 2.0 in. wg total pressure 2.87 Bhp Step 1. Determine the Base Sound Power Levels for a specific fan, hub size and fan speed on pages 102 and 103. Base sound power levels in the eight octave bands are published for each fan size/ hub size combination and for each charted fan speed. Base sound power levels for this example are: Octave Band 1 2 3 4 5 6 7 8 Lw b 36 38 43 43 41 36 31 27 Step 2. Determine the Efficiency Correction Factor. To calculate the Efficiency Correction Factor use the following steps: A. Record the Unit Maximum Total Efficiency (Max. T.E.) from the Base Sound Power Level charts on pages 102 and 103. Unit Maximum Total Efficiency = 77% B. Calculate the Efficiency Ratio. i. First, calculate the actual total efficiency (also displayed on the performance charts) Actual Total Efficiency = CFM x P T X 100% Bhp x 6356 = 6,800 x 2.0 X 100% 2.87 x 6356 C. Enter the Efficiency Correction Factor Chart with the efficiency ratio. Read efficiency corrections (dB) from the chart below. Efficiency Correction Factor Efficiency Ratio 1 1.05 1.1 1.2 1.4 1.7+ Efficiency Correction (dB) 0 2 4 6 8 10 Efficiency Correction Factor = 2 dB Step 3. Determine dB level for correction. Using the volume/pressure correction chart on page 104, determine the dB level for the volume/pressure 2 correction. This is the 10 Log 10 (cfm x P T ) value shown in the formula at the beginning of this page. At 6,800 cfm and 2.0 in. wg of total pressure the dB value is 44. Step 4. dB Correction For Sound Trap <strong>Fans</strong>. Use the following corrections for Sound Trap construction: Sound Trap Correction Factor Octave Band 1 2 3 4 5 6 7 8 dB Reduction 0 -3 -7 -10 -10 -7 -7 -1 Step 5. Finally, total the values found in Steps 1 thru 4 to determine Lw: Octave Band 1 2 3 4 5 6 7 8 + Step 1 36 38 43 43 41 36 31 27 + Step 2 2 2 2 2 2 2 2 2 + Step 3 44 44 44 44 44 44 44 44 + Step 4 0 -3 -7 -10 -10 -7 -7 -1 = Lw 82 81 82 79 77 75 70 72 = 74.6% ii. Then calculate the efficiency ratio. Maximum Total Efficiency Efficiency Ratio = Actual Total Efficiency = 77% = 1.03 74.6% Half-Bladed <strong>Fans</strong> Half-bladed fans are identified with the letter “H” in the model number, for example VAD-20H14. The rotor has half the standard number of blades for higher efficiencies at low pressures. This reduced number of blades generates a lower blade pass frequency and requires a different set of base sound power levels. Base sound data is published for each fan and hub size combination offered with half-bladed rotors on page 103. 101
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Vane Axial Fan Performance Suppleme
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® Factors Affecting Air Performanc
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® Effects of Air Density Effects o
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® Belt Drive Selection A. Use the
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® VAB-24F14 Fan Outlet Area = 3.24
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® Direct Drive Selection A. Use th
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® 30F21M 18H14A 18F14B 18F14A 20F1
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® VAD-18H14 1770 RPM 1.60 1.40 45
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® VAD-18F14 1770 RPM 2.80 2.40 2.0
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® VAD-20H14 1770 RPM 1.60 1.40 40
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® VAD-20F14 1770 RPM 2.80 2.80 40
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® VAD-24H14 1170 RPM 1.00 0.90 40
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® VAD-24F14 1170 RPM 1.60 1.40 2.4
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® VAD-24F17 1770 RPM 4.50 Total Pr
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® VAD-30H14 1170 RPM 1.40 1.20 35
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® VAD-30F14 1170 RPM 2.00 1.80 1.6
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® VAD-30F17 1170 RPM 2.80 6.0 2.40
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® VAD-30F21 1770 RPM 7.00 24.0 6.0
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® VAD-36H14 1170 RPM 1.60 8.0 1.40
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® VAD-36F14 1170 RPM 2.80 12.0 2.4
Page 49 and 50: ® VAD-36F17 1170 RPM 3.50 3.00 35
Page 51 and 52: ® VAD-36F21 1170 RPM 3.50 14.0 35
Page 53 and 54: ® VAD-36F26 1170 RPM 4.00 16.0 3.5
Page 55 and 56: ® VAD-42H17 1170 RPM 2.80 2.40 20.
Page 57 and 58: ® VAD-42F17 1170 RPM 3.50 28.0 3.0
Page 59 and 60: ® VAD-42F21 1170 RPM 4.00 28.0 3.5
Page 61 and 62: ® VAD-42F26 1170 RPM 4.50 4.00 35
Page 63 and 64: ® VAD-48H21 1170 RPM 3.50 3.00 40.
Page 65 and 66: ® VAD-48F21 1170 RPM 5.00 4.50 4.0
Page 67 and 68: ® VAD-48F26 1170 RPM 5.50 5.00 4.5
Page 69 and 70: ® VAD-48F30 1170 RPM 7.00 70 6.00
Page 71 and 72: ® VAD-54H21 870 RPM 1.80 1.60 30°
Page 73 and 74: ® VAD-54F21 870 RPM 3.50 35 3.00 3
Page 75 and 76: ® VAD-54F26 1170 RPM 7.00 6.00 100
Page 77 and 78: ® VAD-54F30 1170 RPM 7.00 6.00 100
Page 79 and 80: ® VAD-60H26 870 RPM 2.80 2.40 50 2
Page 81 and 82: ® VAD-60F26 870 RPM 3.50 3.00 30°
Page 83 and 84: ® VAD-60F30 870 RPM 4.00 70 3.50 3
Page 85 and 86: ® VAD-66H26 870 RPM 2.80 60 30° 2
Page 87 and 88: ® VAD-66F26 870 RPM 4.00 3.50 120
Page 89 and 90: ® VAD-66F30 870 RPM 4.50 4.00 120
Page 91 and 92: ® VAD-72H26 870 RPM 2.80 2.40 30°
Page 93 and 94: ® VAD-72F26 870 RPM 4.50 4.00 140
Page 95 and 96: ® VAD-72F30 870 RPM 5.00 4.50 140
Page 97 and 98: ® Sound Data Sound Power Level Sou
Page 99: ® Belt Drive Base Sound Power Leve
Page 103 and 104: ® Direct Drive Base Sound Power Le
Page 105 and 106: ® Specifications Belt Drive Vane a
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Vane Axial Fans - Greenheck

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