L vent to single wall?

[Bill Smith]

This oil-fired boiler vent reduces at the flue. Am I correct in saying that it transitions from a double walled L-vent to a single walled pipe (maintaining the interior diameter)? BTW - the label was no help.

[Robert J. OConnor]

Are you sure thats double wall L-Vent on the right? It looks like older single wall crimped into a reducer fitting.

Also there are special fittings to go from double to single wall, with one side an insert-and-twist for the double wall, and the other side insert-and-screw for the single wall.

[Roy D. Cooke, Sr]

I agree looks like that to me also ... Roy

[Bill Smith]

You are right Rob (and Roy) - it was a single wall. There were no twist and fit joints. Therefore - the reduction is improper, correct?

[Roy D. Cooke, Sr]

Originally Posted by bsmith

You are right Rob (and Roy) - it was a single wall. There were no twist and fit joints. Therefore - the reduction is improper, correct?

Correct... Roy

[Bill Smith]

Thanks Roy.

[Wayne B. Wilson]

Yes you not reduce a oil fired burner, At least 15 years ago you couldn't lol