Air flow through humidifier

Heating · Duct Systems, Registers and Grilles · printed page 130 (PDF page 131)

Book index entries

Air Flow through Humidifier Humidifier – Air Flow Heating Distribution System – Forced Air Humidifier – on Forced Air Heating Systems

Text in the illustration

supply plenum
return air
humidifier duct damper
close off airflow in summer
open in winter
air flow
the humidistat is often located with its sensor in the cold air return above the humidifier to get a good overall reading of the house humidity
locating the humidifier on the cold air return helps to minimize damage to the heat exchanger in case of leakage (very common)

Generated explanation

The illustration shows a drum-style bypass humidifier mounted on the cold-air return of a forced-air heating system. A flexible bypass duct connects the supply plenum to the humidifier, with arrows showing airflow from the supply through the humidifier into the return. The open humidifier housing exposes a cylindrical mesh-covered drum and a lower reservoir. A duct damper is labeled to close off airflow in summer and remain open in winter. Notes describe locating the humidistat sensor in the return above the humidifier and explain that return-side humidifier installation helps minimize heat-exchanger damage in the event of leakage.

Components

supply plenum return-air duct bypass humidifier flexible bypass duct humidifier duct damper humidifier drum humidifier reservoir humidifier housing

Materials

sheet metal mesh humidifier media

Related illustrations

0788

Humidifier above heat exchanger

· p. 130

The illustration shows a drum-type humidifier mounted on a forced-air furnace supply plenum above the heat exchanger. A flexible bypass duct connects the humidifier to the adjacent return-air duct, with arrows indicating

1259

Close humidifier damper in summer

· p. 224

The illustration shows a drum-type bypass humidifier connected between the supply plenum and return-air duct, with an evaporator coil indicated below the supply plenum. Arrows trace airflow through the humidifier bypass