Forum Discussion

karldavidson's avatar
karldavidson
Explorer
Feb 19, 2014

CFM... Air Flow Question for 35,000 BTU Heater

I just purchased a 31' fifth wheel. It is a Crusader manufactured by Prime Time. The heater is located mid-trailer with ducts in the floor. The air coming out of the registers is virtually non-exist...
Old-Biscuit's avatar
Old-Biscuit
Explorer III
Feb 19, 2014
Rv furnace discharge plenum has openings where flexible duct work is connected. The flexible duct work is then run to the various registers and connected.

They can fall off at either end
The duct work can be kinked
The duct work can be mashed


CFM for a 35000 BTU furnace is typically 375

Also obstructions on return air side of furnace can reduce air flow

About Fifth Wheel Group

19,011 PostsLatest Activity: May 02, 2025