True. And since it's flowing hot air, even if it does heat the wires if they start out cold, I don't think the added heat would call for any derating since there are no splices in that LB.should be fine. seeing as how the exhaust doesnt get hot enough to melt the vent cap, how would it harm the PVC conduit?
It is crazy how many holes are in modern homes. our grampa's homes had one in the center of the roof for the wood smoke.