I am planning to fit the ducting in my boat before buying
forced air heater. I know where I want it and how to fit it. The question i have is, if the Home Depot flexible ducting (which seem to be for clothes drier exhaust
only) is adequate from temperature aspect? The guy at Home depot told me only 26 gauge rigid sheet metal ducting is to be used for the forced air heat ducting and not the flexible ones??? Is that the fact? Do I need to go and buy the ducting from heater company which charges $6 / ft?