Jerry,

I kind of have to agree with Darren. One B-vent product instructions (DuraVent) uses ambiguous wording, one product (AmeriVent) writes "whenever possible" and another (MetalBestos) does not mention it at all. This apparently means that we must know all of the installation instructions of all of the B-vent manufacturers in order to properly report on them.

Either that, or we defer on everything.

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The apostrophe troll.