179 heater vent

Thanks Stephen I'll take a look at that cold air return your talking about. I know the heater is working real will but maybe I can get it working even better.  I do all the welding myself but the metal is a little over kill. 14 ga. steel.  The vent is easy to remove, only two srews. Happy Camping  

It has knockouts, but what I could not find are the parts (cover to substitute for the grill, gaskets, etc.) needed to convert it for ducted use. I think the knockouts are only for heat output, not cold air return. In the direct discharge model, the lower-right part of the vent and the gaps around the cover serve for cold air return. That air then circulates around the unit and gets pulled in at the back (the slots on the housing) to get blown through and out of the unit. It makes sense as it would help keep the body of the heater from getting hot enough to set the surrounding materials on fire.