Natural Gas furnace flue

So… is it flexible B-vent (1" min clearance), dryer vent, range hood duct, or bathroom exhaust fan duct?

3-4" single-wall b-vent connector or double wall flex b-vent, yes 1in clearance.

Kenton… the 1" min clearance referred to above if the rigid (non-flex) section going through the attic space… NOT the cheap ass flex stuff!

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Looks like 4" min to me… IF it’s the ‘quality’ stuff!

https://duravent.com/wp-content/uploads/2019/12/FasNSeal_Flex_Catalog.pdf

Don’t forget the flex gas line through the side wall of the cabinet.

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