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Vent Air Flow Rates

Model Stack Openings Inner Screen Air Speed Air Speed Intake and Withdraw
Square Inches Square Inches Stack FPS Screen FPS GPM
S 4 12.57 70 22 3.94 860
PD-SD 8-5 19.64 84.5 22 5.12 1350
S 6 & SD 10-6 28.27 102 22 6.1 1940
S 8 & SD 12-8 50.26 165 22 6.71 3450
S 10 & SD 14-10 78.54 236 22 7.34 5400
S 12 & SD 16-12 113.01 280 22 8.82 7700
SD 18-14 153.93 352 22 9.57 10,500
SD 20-16 210.06 402 22 10.77 13,500
SD 24-20 314.16 628 22 15.24 21,500
S 24 452.39 905 21.32 10.63 30,000
SD 30-26 531.00 1470 (use 24” screen) 22 7.86 36,000
SD 36-32 804.25 1810 (use 24” screen) 22 9.75 55,000
SD 40-36 1018.00 2036 (use 24” screen) 22 10.99 69,000
SD 48-44 1520.00 3040(use 30” screen) 21.11 10.55 100,000

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