Related illustrations

0733

Backdrafting

· p. 117

The illustration shows a gas furnace with a draft hood, an upward-curving vent connector, and dashed outlines of the supply plenum and cold air return. The open front exposes the burner assembly and gas controls, while a

0774

Backdrafting

· p. 126

The illustration depicts a gas furnace with an exposed burner compartment, draft hood, and vent connector rising from the top. Dashed outlines indicate the supply plenum and cold air return, with an air filter at the ret

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

0801

Blockage switches

· p. 132

The illustration shows a cutaway gas furnace and a schematic gas boiler, with blockage-switch locations highlighted by dashed circles and arrows. Each switch is positioned below the draft hood area. The furnace view expo