Related illustrations

0803

High efficiency furnaces have long heat exchangers

· p. 133

The illustration shows a schematic cutaway of a high-efficiency gas furnace with a long, serpentine primary heat exchanger and a secondary heat exchanger below it. Combustion air enters from above at the burner, whose fl

0716.9

High efficiency gas furnace

· p. 113

A cutaway diagram shows a high-efficiency gas furnace with a lower house-air blower and filter, primary and secondary heat exchangers, and an upper warm-air supply duct. Dashed duct outlines and colored arrows indicate c

0804

Condensation in high efficiency furnaces

· p. 133

The schematic depicts a high-efficiency condensing gas furnace with a burner, primary and secondary heat exchangers, and a house air blower. Arrows show combustion air entering above the burner and exhaust gases passing

0806

Venting for high-efficiency furnaces

· p. 133

The illustration shows a cutaway of a high-efficiency condensing gas furnace with a burner, heat exchangers, house air blower, and induced draft fan. Arrows trace combustion gases through the heat exchanger assembly and

0716.3

Conventional gas furnace

· p. 113

A cutaway illustration shows a conventional gas-fired forced-air furnace with a labeled seasonal efficiency of 60%. Cold return air passes through an air filter or air cleaner into the lower circulating-fan compartment,

0816

Venting for high-efficiency furnaces

· p. 136

A cutaway schematic shows a high-efficiency condensing gas furnace with a burner, serpentine heat exchanger, secondary heat exchanger, induced draft fan, and house-air blower beneath the supply plenum. Arrows trace combu