Originally Posted by RV7 To Go
SNIP I oriented the heat muff inlet to the back of the exhaust pipe and the outlet to the front in order to get the hottest air at the outlet. SNIP
I think this makes two of us out of thousands of RV's! A counter-flow heat exchanger can be quite a bit more effective than a concurrent flow one. Almost every one I've seen has it connected the lesser effective way.