Venting overhead heater/furnace

[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

 

[mod600]

Sorry, I re-posted this in the heating section...

 

[csp]

What you want is called a thimble. It's two pieces with one sliding inside the other. This will keep any combustibles away from the vent pipe.

 

[mod600]

OK..that make sense...I've seen them before...

 

[danski0224]

Horizontal venting is not allowed using Category I vent products.

 

[csp]

danski,
Care to put that in laymen's terms and how it applies to what the OP is wanting to do? I know what Category 1 means, but most people don't.