Gravity furnace

Heating · Heat Transfer · printed page 112 (PDF page 113)

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Book index entries

Gravity Gravity Furnace

Text in the illustration

second floor
heat registers are on inside walls
usually only one cold air return (on the main floor) and it is often located near an outside wall
several registers are often fed off one duct
air return
first floor
basement
supply ducts have exaggerated upward slope and are large and round
supply duct
furnace is centrally located
no fan and no filter
cross section

Generated explanation

A cross section of a two-story house shows a centrally located gravity furnace in the basement. A large supply duct slopes upward from the furnace and continues through an interior wall to heat registers on both floors, with arrows indicating warm air entering the rooms. A single main-floor cold-air return near an outside wall connects to the lower portion of the furnace through a large descending duct. Annotations identify the supply ducts as large and round and emphasize their upward slope. The system is shown without a fan or filter, illustrating gravity-driven air circulation rather than forced-air distribution.

Components

gravity furnace supply duct cold-air return duct air return opening heat registers interior wall floor assemblies basement foundation walls

Materials

sheet metal ductwork concrete foundation

Related illustrations

0817

Gravity furnace

· p. 136

A house cross section shows a centrally located gravity furnace in the basement serving two floors. A large return duct descends from a first-floor air return near an outside wall to the base of the furnace. A supply duc