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propex heater, looking for vents?


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#11 goinoregon

goinoregon

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Posted 28 December 2020 - 10:27 PM

If you read the install guide, I think the call for 3' of separation.  Which is why I was surprised when I saw that cool single piece vent fitting you are looking for.  No, not to hot, and not all that "enclosed" either.  These Propex furnaces are amazingly efficient.  There is not a lot of air leaving that exhaust tube.  I made the hole in the plywood bigger than necessary to clear the tube, and made sure the supplied silicone sleeves were in that space so as to minimize how hot the tubes were that might be in contact with the wood.  Sealed the remaining gap with red high temp silicone designed for automotive use.  No issues so far in the two camper builds I did with Propex heaters.

good to hear.  yes, i liked the looks of the propex vent, but i also like your solution - less stuff going through the exposed exterior.  and upon reading the install guide again, i think it helps to have the inlet and outlet a bit farther apart.   very much appreciate your input.


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Oregon


#12 Vic Harder

Vic Harder

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Posted 29 December 2020 - 12:33 AM

I'm also in the process of incorporating an idea I gleaned from the Chinese Diesel Heater installs... The comment was made on another thread that these heaters make for drier internal air, which puzzled me.  Most RV heaters work much the same, with external combustion air and combustion exhaust coming from outside, and - like your home furnace - heated air and cold air returns vented from/to the inside of the heated space.  Turns out some folks are taking the "cold air return" from OUTSIDE as well.  This will be less energy efficient, but will also make for drier internal air.

 

So, my Propex install is getting a mod to take the cold air return from outside, via one of the turnbuckle access doors.  More details and pics to follow.


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