Vent extension into chimney

[Mike Lamb]

Is there a reference as to how far a vent should stick into a chimney liner? I believe I read somewhere that it should be flush.

[Chad Fabry]

503.10.10 Chimney connection.

Where entering a flue in a masonry or metal chimney, the vent connector shall be installed above the extreme bottom to avoid stoppage. Where a thimble or slip joint is used to facilitate removal of the connector, the connector shall be firmly attached to or inserted into the thimble or slip joint to prevent the connector from falling out. Means shall be employed to prevent the connector from entering so far as to restrict the space between its end and the opposite wall of the chimney flue

[mjr6550]

Look at the IRC. M1805.2 or around there. It states that the connector should be flush with the inside face of the liner.

[Plummen2]

Well that would depend on what part of liner it's flush with.