Vent connector length

Heating · Venting Gas Furnaces · printed page 125 (PDF page 126)

Book index entries

Gas Furnace – Length Length of Vent Connector on Gas Furnace Vent Connector – Length for Gas Furnace Venting – Gas Furnaces

Text in the illustration

B-vent
return
supply
vent connector
length of vent connector:
preferred - <5'
marginally acceptable - 5' to 10'
suspect - more than 10'
rule of thumb: maximum of 1.5' horizontal run per 1" of vent connector diameter
gas furnace

Generated explanation

The illustration shows a gas furnace with a vent connector rising from its top and extending upward toward a vertical B-vent at the left. A horizontal dimension line measures the connector's horizontal run between the furnace connection and the B-vent. The annotations classify lengths under 5 feet as preferred, 5 to 10 feet as marginally acceptable, and more than 10 feet as suspect. A stated rule of thumb limits horizontal run to 1.5 feet per inch of vent connector diameter. Supply and return ducts are also shown, with arrows indicating airflow.

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