Mr. Heater MHU Venting in Soffit

[miwenner]

I am in the process of installing a MHU 50 in my garage. It's hard to visualize without the heater mounted so I will try to explain it the best I can and try and answer any questions. I plan to mount in the corner up against the ceiling. The vent outlet will be close to the ceiling, but still should be low enough to allow ¼" of rise for each foot. When I had a local HVAC guy out he said it may be possible to vent out the side of the wall then a 90 to where the soffit ends (running along the garage, not out from the garage), then another 90 to go back vertical above roof line, and then end. After further inspection on my own I noticed that the soffit is lower down than my ceiling in the garage. My garage ceiling is 97¾ from the floor. The soffit is 88¼ from the garage floor. So if I do run it out through the garage sidewall I will be into the soffit. What I am wondering is, am I able to run out the sidewall and into the soffit and make my 90 in the soffit, then come out of the side of the soffit and up? The soffit panels are vented and hollow above the panels where the 90 would be. I'm sure there is more information needed so let me know
Thanks

 

[The Cobbler]

sometimes it's just easier to vent vertically, any reason you can't?

 

[miwenner]

Insulation is blown in the attic and heater is below when the vent chutes run. With the pitch of the roof and how close it would be to the edge of the roof there is not much room to work while in the attic. It's not impossible, but also would pose challenges. I also would prefer to not have to put a hole in the roof.

 

[allinon72]

You absolutely do not want the vent to run up against the siding, it'll probably melt it, won't be venting it properly (especially with 2 90s), would be a blatant code violation and look pretty bad. The only proper way I see to do it is vertical.

 

[BillK]

The instructions say 20ft max with 2 elbows. I think you are pushing it. I would punch it straight up through the roof and be done with it.

 

[PassnThru]

Judging the roof slope and the soffit depth from your last picture I seriously doubt you would have enough room between the top plate and the roof deck to run the pipe through there. I have a deeper soffit with about the same roof pitch on my house and it took some trimming on the edge of the top plate to run my bathroom fans to the soffit. And that was using a flexible duct. I would pull some of the soffit off before you go any further and confirm that it's even possible.

 

[hake]

Just curious, what was the outcome?

 

[D45]

Just curious, what was the outcome?

User Account Lasts seen Aug 11, 2021

 

[PoorUB]

User Account Lasts seen Aug 11, 2021

Another one hit wonder!

I get a kick out of the number of people that pop in, post a question and never come back.