The last tactic in the arsenal is pushing it up through the thimble. But 1 12" flex could buy enough space if you replaced the two 90s with it. Without a picture it's hard to say what will work but there are 12" flexible sections of B vent available.ġ2" B vent flex Unfortunately they are proprietary. You can even trim up to the rivet to buy some space. C vent 90s are smaller and easier to work with. This shows a B-C adapter with a C vent 90Ĭ vent isn't actually a thing, it's just what people called regular venting.Įverything below the B-C adapter is fair game you could potentially remove the B vent 90s attach the B-C adapter to your straight run and then use C vent the rest of the way. You don't have a joint in the straight run but you do have two 90s
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