Related illustrations

0811

High-efficiency furnaces and duct sizes

· p. 135

Side-by-side cutaways compare a conventional gas furnace with a high-efficiency gas furnace, showing burners, heat exchangers, blowers, supply plenums, and exhaust paths. Both units show entering air at 70°F; supply air

0716.6

Mid-efficiency gas furnace

· p. 113

A cutaway illustration shows a mid-efficiency gas furnace labeled with a seasonal efficiency of 80%. Cold return air enters through the side-mounted filter or air cleaner, and a circulating fan in the lower compartment m