side venting Mr heater in northern Alberta

[AlbertaSS]

Hello all, long time lurker but recently joined. I finished building a 30 x 45 shop and am in the process of installing a 80,000 btu Mr. heater unit. I am going to horizontal vent it. After doing a lot of research on the national codes I can't find any info on the local codes, being Lac ste anne county. What I am after is the distance the pipe can be from the soffits. The national code says 4 feet vertically then terminate another 12 inches past the eave. I can see the 12 inches past but 4 feet below seems ridiculous. In my mind bringing it up closer would give less vapour drift., less chance of exhaust entering the attic space through the soffits. Especially with the new double wall pipe reg's. Any one have any insight in our area? If it is 4 feet then so be it. Thanks alot

 

[AlbertaSS]

Ok, how bout anyone in Alberta?

 

[raceman6135]

I can't speak to codes in your area, but here in Calgary, I was informed that yes, the 4 foot minimum clearance both horizontal and vertical are required, as is the minimum 12 inch projection past the edge of the eave.

Also note that the vent must have a minimum 6 foot clearance from an inside corner formed by two exterior walls.

For me, those restrictions, plus the huge increase in price of the piping required to go horizontal, made my decision to go vertical cheaper and easier, and to me, a 'chimney' going straight up looks 'right'.

One way to meet code, if your building design will allow it, is to not use soffit vent (under-eave vent) in the area where you want the furnace vent to be. Double-check with your licensed gasfitter, but I don't see why that wouldn't meet code. (I say check with your gasfitter because you will probably have to have him/her obtain the permit for the gas connection, and he/she will likely know any peculiarities in your area with regard to what will pass and what won't.)

 

[AlbertaSS]

Thanks for the info. I am aware of the other things you mentioned. Have been researching this to death lol. I will be doing the work myself as I have done all the work on the shop except the slab. The building already has insulation in the attic. I should have ran the chimney through the roof before the insulation was blown in. The roof is metal, 4/12 pitch. Not steep by any means but unless the pipe comes out near the ridge I am afraid of it getting wiped off from sliding snow. Haven't cut any holes yet, still trying to figure out the best thing to do... I have installed a few wood stoves in older homes where I had to deal with cutting into the ceiling with insulation in it . Guess this wouldn't be that much different.

 

[northeimcustom]

i just did a horizontal vent on my garage. i also researched it to death. i opted to to a horizontal because it was much easier for me to do by myself. didnt really wanna go up on the roof, in the attic back and forth yada yada yada.