Cooling Coil Face Velocity and Carryover Check
Face velocity = CFM / coil face area, checked against the ~500 fpm wet-coil carryover limit. 2000 CFM on a 24x18 coil (3.0 ft^2) -> 667 fpm, carryover risk; 1200 CFM -> 400 fpm, safe. Above the limit a wet coil blows condensate past the drain pan. The coil manufacturer's rated face velocity governs.
Formula and source
face_area = w x h / 144; face_velocity = CFM / face_area; carryover if velocity > threshold (~500 fpm).
The cooling-coil face velocity and the moisture-carryover limit, standard coil-selection practice (ASHRAE), by name.
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