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When changing out a furnace or water heater, is it necessary to change the vent connector from 3 to 4 inches?

April 26, 2017changing connector furnace inches necessary vent

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When changing out a furnace or water heater, is it necessary to change the vent connector from 3 to 4 inches?

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Maybe. You must change the vent connector when required by the listing of the appliance. When using a plumbing minor label to replace an existing water heater, a mechanical permit would not be necessary to change out a short section of the water heater connector. If the vent is being changed or modified or a liner is being installed, a mechanical permit would be required.