Combustion Air Inlet Box--(Horizontal Application)

[Dakota46]

I am installing a Beacon Morris brt 45 with horizontal venting and using the separated combustion kit.

The wording in installation manual states "the exhaust vent system must remain at a minimum distance of 1" from all combustible materials. "

And the next sentence says " Any part of the vent system that passes through a combustible material must be properly insulated. "

I need some help with the interpretation.

Mounted between the 16" centered wall studs my separated combustion inlet box will only have about 3/4" clearance on the sides. But the actual vent pipe (4" Category 3) will be safely isolated at least 3" from the framing.

I can't see how the air inlet box would get very hot on the surface. It also is drawing cool air from outside.

Would some unfaced fiberglass be sufficient as insulation between the separated combustion air inlet box and any wood framing /combustible materials?


Pictures for reference
7" pipe is the outer fresh air inlet that will pass through the wall.

Sent from my SM-G900T using Tapatalk

 

[xjfish]

Bump, same questions on the same setup... No wall thimble is needed with this setup correct? Firestop? I'm just a little confused on the proper way to pass through a wall with the Sterling concentric kit.

 

[CKS1955]

...7" pipe is the outer fresh air inlet that will pass through the wall.

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The hole through the wall needs to be 7”, the fresh air inlet provides the necessary clearance for the exhaust pipe.

Jay

 

[xjfish]

The hole through the wall needs to be 7”, the fresh air inlet provides the necessary clearance for the exhaust pipe.

Jay

Thanks Jay. Spray foam around fresh air inlet perhaps?

 

[OH_Varmntr]

Thanks Jay. Spray foam around fresh air inlet perhaps?

That's what I did with mine. Although my Sterling kit for my 120KBTU heater was a 9" fresh air intake with a 5" stainless exhaust.

Shoved the 9" fresh air intake pipe through a 9" hole and spray-foamed around it on the inside, applied gray caulk on the outside.

Here's my kit all buttoned up.
Untitled

 

[xjfish]

That's what I did with mine. Although my Sterling kit for my 120KBTU heater was a 9" fresh air intake with a 5" stainless exhaust.

Shoved the 9" fresh air intake pipe through a 9" hole and spray-foamed around it on the inside, applied gray caulk on the outside.

Here's my kit all buttoned up.