InWC

Air economizer mixing boxes consist of outdoor and return air dampers with an assumed air pressure drop of 0.07 inWC (18 Pa).

An air pressure drop of 0.02 inWC (5 Pa) is assumed across this steam humidifier's manifold.

An air pressure drop of 0.05 inWC (12 Pa) is assumed across these ultrasonic humidifiers.

An air pressure drop of 0.15 inWC (37 Pa) is assumed across an evaporative humidifier of this thickness.