Duct clearances - typical

Heating · Furnaces and Boilers · printed page 177 (PDF page 178)

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Book index entries

Clearance – for Ducts on Wood Furnaces Ducts – Clearances for Wood Furnaces Duct Clearances Wood Furnace

Text in the illustration

floor framing
2"
6"
cold air
plenum
6 feet
hot air
wood furnace
cross section

Generated explanation

The cross section shows a wood furnace with a cold-air return entering at the top and a hot-air plenum feeding a horizontal supply duct beneath floor framing. Arrows indicate downward cold-air flow and upward hot-air flow. The plenum and the first 6 feet of supply duct are shown with 6-inch clearance below the framing. Beyond that distance, the supply duct offsets upward, with a 2-inch clearance indicated. A segmented flue connector is also visible at the side of the furnace.

Components

wood furnace hot-air plenum supply duct cold-air return duct floor framing flue connector

Materials

sheet metal ductwork wood framing