In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
where to ask a tin knocker question , this is the question
it isn't actually for scorched air, but for a vent cap. i'm looking for a 4" vent cap that is oversize enough on the receiver to just slide in 4" duct without a crimp. then i don't to figure the length and precrimp or waste a crimp off my last length (until i can find an affordable pexto, but that's a whole nother question).
maybe somebody here has sussed this out or knows what wall the tin knockers hang out on.