installing Hot Dawg garage heater

[athuswal]

I hope you can help me out with some advice. I live in Canada and purchased a Modine Hot Dawg heater (HDS45) for my garage. I ordered it from the US. When my HVAC friend came over and had a look at the unit he was stumped as to how to vent it properly. The metal fittings on the back of the unit for attaching the vent pipe was about 3 1/8" diameter, too big for 636 3" pipe. The manual is a bit unclear but according to my HVAC friend they are specifying metal pipe which (he says) is not to code in Canada. The unit is CSA approved. I would like to vent out the side of my garage for simplicity and the manual indicates this is one of the ways the unit can be vented. The unit has an exhaust fan.
I think what I need is just a coupling that will allow me to connect 636 pipe to the fittings on the Modine. If I can find a solution for that I think I should be ok. Are you aware if such couplings exists and what it is called?

Andrew

[Hondahead]

The manual is a bit unclear but according to my HVAC friend they are specifying metal pipe which (he says) is not to code in Canada.


I download the INSTALLATION AND SERVICE MANUAL and the installation is strait forward, and well with in the scope on any well trained Plumber/Gasfitter or HVAC tech.

Quote from installation manual "All vertically vented heaters are category I venting.
All horizontally vented heaters are category I or III
depending on venting."

System 636 is for a category IV appliance.

Stainless steel or "metal pipe" is to code in Canada for a category II or III appliance.

B vent is acceptable for a category I appliance.

Vent the heater vertically and you can use B vent.

[HVAC HAWK]

i use b vent for a horizontal venting
if you have a metal shop close they can make something for you or get your pipe from the US