Garage heater exhaust through insulated wall

[brentr678]

Hi everyone, I'm going to be installing a gas garage heater at my home. I had a plumber run the gas but planned on running the exhaust myself. I've been struggling to find good resources online for how to run the exhaust through my garage wall which is insulated with fiberglass. The heater (50k btu Mr. Heater) installation manual tells me I need to use Cat 3 venting since ill be going horizontal out the house. And since ill be going through the wall to use a wall thimble. I picked up a wall thimble and Cat 3 pipe but given the heat of the exhaust I'm still concerned that the 1 inch spacer the thimble is providing between the Cat 3 single wall vent and the insulation/drywall/studs in the wall isn't sufficient and will result in a fire. So I guess i'm looking for some reassurance that given my situation the 1 inch wall thimble is enough and I can put my concerns to rest. I attached pictures of the setup if it helps.

 

[ICE]

I am used to seeing the vent terminate above the roof. However I don't know everything. I saw this actuall method in the company installation manual. There was a note to avoid any wall that sees wind.



I would like to see the finished product.

 

[Gregg Harris]

Hi everyone, I'm going to be installing a gas garage heater at my home. I had a plumber run the gas but planned on running the exhaust myself. I've been struggling to find good resources online for how to run the exhaust through my garage wall which is insulated with fiberglass. The heater (50k btu Mr. Heater) installation manual tells me I need to use Cat 3 venting since ill be going horizontal out the house. And since ill be going through the wall to use a wall thimble. I picked up a wall thimble and Cat 3 pipe but given the heat of the exhaust I'm still concerned that the 1 inch spacer the thimble is providing between the Cat 3 single wall vent and the insulation/drywall/studs in the wall isn't sufficient and will result in a fire. So I guess i'm looking for some reassurance that given my situation the 1 inch wall thimble is enough and I can put my concerns to rest. I attached pictures of the setup if it helps.

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Flue temperatures are not high enough to cause issues

 

[Yankee Chronicler]

This is going to be a problem:



That's not an acceptable flashing detail -- because there is no flashing.

 

[klarenbeek]

If you use the factory thimble to go with the pipe it's been tested that way. You should be good going with that.

 

[brentr678]

Thanks for the replies everyone! Definitely enjoy the DIY projects but need to do it the right way.

Unfortunately going up out the roof isn't an option for me as there is a living space above the garage so horizontal out the wall it is.

Definitely need to add flashing you are right. Still pretty easy to add that fortunately.

Yes, the thimble is the same manufacture and is the recommended one so should be good there. I see both products in a kit you can buy together.

 

[ICE]

Perhaps the carpenter that installed the siding is available to cut in the vent. From the looks of it, that carpenter knows his stuff.