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And these types of things are EXACTLY why I want to do it myself. If I have to become an expert by studying for a week in order to check the "expert" that I am paying my hard earned money to, I may as well install it myself. If I had someone that I absolutely trusted to do the job right...

So - I've finally figured out why I can't find the (&*(*^ correct pieces to do the job. Menards is out of the Amerivent 4EDC Draft Hood Connector which I think may be the piece that mates the B-vent up to my heater. Both local menards are out of stock even though they say in stock on line...

Oh ok - I missed the part where you said you used the separate combustion option.

Why the upsize after the heater? I really don't want to spend more on venting than I did on the heater :)

Thanks - that may be the missing piece. My heater did not come with any kind of adapter. It has a 4" exhaust sticking out the back, nothing more. It doesn't quite match up with the double wall B-vent adapter I picked up at Menards. I must need a single wall to double wall adapter, that makes...

So it seems that every time I think I understand what needs to happen for venting this thing, I get more confused :-/ I may still get a Pro to do the install, but even if I do I'll want to understand it so I can check the work. I pretty much don't trust anyone to do a proper job anymore. I...

Thanks, that makes sense. And also thank you to nwav8tor for the venting clarification! And WOW, that Cat III piping is expensive :-/ It's going to cost me more than the heater.

Does that mean installing a fused switch at the heater is a no no?

So I stopped at Menards on the way home. It seems they have B-Vent (Category I according to the sales droid), and Category III. Cat III seems to be for horizontal venting and it's ultra expensive, and Cat I seems to be ok for vertical. In the location I'm at with my heater, I can go either...

I just bought the same furnace for my garage and am getting ready to install it. However I have confusion about the venting requirements. The manual lists both Category I and Category III options. In addition, it mentions that the vent termination should be 2 feet higher than the highest...