Okay, but the metal of the unit will still get hot, and if a highly flammable gas were to encounter a heat source, isn't there the possibility of combustion, especially if the flammable gas becomes concentrated in a confined compartment?

From: Loren Busch <starwagen@GMAIL.COM>
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Optima Blue D31M

>  RE: The out-gassing possibility of the standard automotive battery, coupled
> with use a propane heater like the Propex is enough to give me pause. Is
> this gas flammable?
> 
> The Propex takes all combustion air from outside the vehicles and all
> exhaust goes outside the vehicle.  No interior air gets near the ignition
> source.  Interior air is only pulled through a heat exchager, total
> seperation from the ignition source.
> 

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