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Ventilation
CFM = Length x Width x Height x Air Changes/Hour x Hour/60 Minutes
Basic Ventilation: 6 air changes per hour
NFPA820: 12-15 air changes per hour occupied space
Covered Tanks Ventilation: 5 CFM per square foot of surface
Duct and Inlet Velocity: 2,800 FPM
Open Air Intakes: 150 FPM
Length x Width x 150 FPM = CFM for air intakes
3.14 x Radius2 x 150 FPM = CFM for air intakes
One Cubic Foot Per Minute (CFM) = 1.7 Cubic Meters Per Hour
One Cubic Foot Air = 0.075 pounds @70°F, sea level
Duct CFM @ 2,800 FPM Diameter CFM 2" Lances 12" 2,200 1 24" 8,800 4 36" 19,800 4 48" 35,200 4 60" 55,000 6 72" 79,000 6 84" 107,700 12