HVAC Damper Pressure Drop

HVAC Systems & Components

Typical HVAC damper pressure drop vs flow velocity graph. Units are inches and fpm (feet per minute).

HVAC damper pressure drop vs flow velocity graph

Where:

V (Velocity) = CFM/(Square ft. Damper Area)

Adapted from HVAC Systems Duct Design, Third Edition, 1990, Sheet Metal & Air Conditioning Contractor's National Association