How long should vent connectors be?
How long should vent connectors be?
Expert
Maestro
The horizontal run of the vent connector should be as short as possible. The greater the near-horizontal length of the vent connector, the more difficult it is for exhaust products to travel from the appliance to the outdoors. Exhaust spillage into the house is the implication.
Look for vent connectors to be less than 5 feet long. Where they are 5 to 10 feet long, the situation may be acceptable, but it's marginal. Vent connectors more than 10 feet long should be described as suspect and investigation by a specialist should be recommended.
A guideline some people use is a 1.5 -foot maximum horizontal run for every one inch of vent connector diameter. Another guideline is that the vent connector length should be no more than 75% of the chimney height. We recommend further investigation where vent connector lengths are suspect.
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