I run forced air AND ventless
I have had my Ranni for 4 years now ( 5 brick also)30,000 btu- and let me tell you you CANNOT or SHOULD NOT run the ventless heaters running down the road....I used mine to heat up the trailer after I push the 1st two sleds out the front V door of my 28' Mirage.
These will ignite gas fumes as so will the blue flame heaters.
I run a 20,000 forced heater down the road to dry the trailer and clothes out- but trying to use it to get the trailer warm quick just doesn't work. This is where the ventless heater warms up quicky to get dressed...
The ventless WILL create moisture- and I have had the 12v radio shack computer fan on it with a turbo shroud- and it just doesn't spin hard enough to do any good-
Want a real air mover that works and heats the entire trailer with the ventless and the forced air?
I went to Flying J and picked up a 12v in cab fan ( for the semis) the one with a shroud around the blades. It has a hi/low/off and its chrome-and can be mointed any position.. for $28.00 this thing MOVES the Air
ALso get them propane tanks out of your trailer cause I can show ya pic's of whats left of an enclosed running a ventless down the road- fumes ignite not the liquid.. Propane or the fuel venting from your sled
just my 02
MD