orangetang

I'm installing a similar unit in my garage, and can say that even the local HVAC contractors would still use a c-vent 90 off the unit and adapt it over to b-vent through the thimble and out past the eave. I called the city prior to starting this install and they confirm that as long as the c-vent is no closer than 6" from ceiling, wall, etc. and the b-vent no closer than 1", there is no problem. Unfortunately for my, my eave is almost 3 feet from the wall I'll be venting through, and the unit is over 2 feet wide, so I'm kind of in a bind for the horizontal maximum of 5" plus a 90 and a condensation leg... It seems kind of weird that Mr.Heater placed your gas fitting right up against the exhaust port like that. I bought a Reznor and there seems to be a lot more room for ducting and gas-line to be run. Hearthman, What are you required to run instead of c or b vent if neither are approved? All these heaters have a single wall, 3" or 4" exhaust. Or do you mean, this style of heater in general is not approved for installation? IE: Lennox, Reznor, Big Maxx and a handful of others have been selling unsafe, non-approved, uninstallable heaters to the public. tcfinishing, shouldn't you have some sort of condensation drain or 'drip leg' on your vent? For the record, I have absolutely no training in any form of HVAC, electrical, plumbing, whatever so I really am asking.