Related illustrations

0775

House air flow

· p. 127

A cross section of a house illustrates a forced-air heating distribution system with a furnace below the occupied room. Cool air enters a floor-level return grille and travels through return ducts toward the furnace filt

0750

House air flow

· p. 121

A cross section of a house illustrates air circulation through a forced-air furnace and its supply and return ducts. Cool room air falls toward a return grille and is pulled through the return duct, labeled 70°F, to the

0796

Return grille in furnace room

· p. 131

The illustration shows a gas furnace beside a cold-air return duct with a return grille opening into the furnace room. A red prohibition symbol marks the grille as improper. The furnace has an exposed burner assembly, a

1282

Flow of cooled air - older-style ductwork

· p. 229

A house cross section shows a basement furnace and air-conditioning unit connected to supply registers on two occupied levels and a single lower-level return grille. Supply ducts run beneath the lower floor and rise alon

0787

Air flow through humidifier

· p. 130

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 t

1253

Flow of cooled air - older-style ductwork

· p. 222

A house cross section shows a basement furnace and air-conditioning unit connected to supply and return ductwork. Supply ducts feed floor-level registers on the lower and upper occupied levels, while a single return gril

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