Venting overhead heater

[mod600]

Per my OSB thread I recently posted, I'm working on finishing the shop portion of my pole barn. I'm planning on getting a Mr. Heater Big Maxx 80,000 btu overhead heater. I'm planning on installing it in the corner over my front service door and aiming it at the middle of the opposite wall. I want to vent it horizontally out thru the wall of the building. Where ever I end up venting it, would it be wise to adding in a bunch of blocking to run the vent pipe thru? That way there would be no insulation touching the vent pipe. Just bore a big hole (4" I believe is the vent pipe OD) thur and run the pipe thru it and seal it up with expanding foam. Or is there a better way to do this?

Since I know my plan up front, I wanted to add any blocking in before hand and do what would make the most sense.
Thanks!
mod60

 

[Milton Shaw]

Most of them I have seen have a through the wall collar that takes about a 6" hole and then centers the hot pipe in the middle of it. Check your supplier and see if that's not what they recommend. Then around it I used fire grade foam insulation.

 

[danski0224]

Horizontal venting is not allowed if Category I vent piping is used. Cat I is Type B vent (double wall) and plain old single wall pipe.

 

[dave67fd]

Horizontal venting now puts the heater into a catagory III heater meaning single wall can no longer be used. Double wall is required.

 

[Shocker]

On my Mr. Heater 45,000btu unit, I went with something like you are doing.

I used a standard 4" thimble and 4" B vent double wall right after the elbow. Slight downward to the outside. I also had the final end about 2 feet from the wall into open air.

 

[danski0224]

Horizontal venting now puts the heater into a catagory III heater meaning single wall can no longer be used. Double wall is required.

B vent is not rated for horizontal venting- it is not Cat III. This is the basis of the attachment in my prior post.

Gasketed stainless steel single wall vent pipe must be used, with provisions for flue gas condensate collection and removal. The same types of thimbles and other accessories exist for UL listed single wall vent pipe systems.

 

[Angelfire]

Unrelated to your venting question, you may want to research the location you are proposing. From all I've seen and heard, you should aim to place the heater so it projects to your coldest spot in the space, ie. your large door. I'm no HVAC expert by any means so take this with a grain of salt....

 

[nwav8tor]

On my Mr. Heater 45,000btu unit, I went with something like you are doing.

I used a standard 4" thimble and 4" B vent double wall right after the elbow. Slight downward to the outside. I also had the final end about 2 feet from the wall into open air.

I thought that horizontal runs were supposed to slope UPWARDS from the heqater to outside!

Paul

 

[Shocker]

Hmm, well, I wanted any condensation to run away from the heater and out the exhaust.

 

[RCStocker]

It must be double wall. contact your local building department to see what is required by code. They don't need to know you are doing it but just thinking about it. If you can run it streight up throug the roof go for it.

 

[KCarGuy]

I Hung my 75K unit in a "Dead" Spot, under my Stairs.
What I mean by "Dead" Spot, is that the air doesnt get any circulation or movement there. When the Fan kicks on, it helps with that.
I have a ceiling fan to help air movement through out the garage.

The Unit is facing forward toward the front of the garage, about 18" from the back wall.

I used 3 adjustable 90's which are heavier than the singlewall straight pipe. and a 3 foot section of straight single wall pipe (for outside)
My Vent makes an left turn out the back, then a right turn through a thimble and the wall, then another 90 up about 3 feet to a cap.

The entire vent is sealed with aluminum tape, its about 6 feet long, and I checked it, It never gets over 120 Degrees.
The Unit blows nice hot air and warms up my 30x25 Garage quickly.

I am sure that its not what the inspector would jump for joy over, but it works great and i feel warm and fuzzy about it.
I go through a cleaning and check up every year before I fire it up.
I have used my setup for 5 years now, and I am very happy with it.