Where to vertically vent?

[peteymit]

Hello everyone! First time posting but I am stuck. I have two 90s, two 18" lengths, one adjustable 4-12" length, one 48" length and the thimble, cap, flashing and storm cover. I can't decide to run the venting up behind the unit and go behind the fan or come out 18" and be between the outside wall and the first joist? I'm not sure what the rules are on whether I can run within x amount of inches from the outside wall or what the situation is. The unistrut was a good idea until it came time to run the vent! Any advice would be greatly appreciated!

Sent from my SM-N960U using Tapatalk

 

[Pruittx2]

First off, look up you local building codes and follow those. With B-vent you can be 1in from combustibles,, but that doesn't take into account distance from overhangs on the roof side of things.

Did you buy the vent install kit?

Are you saying that with the unit strut installed as it is,, it's in the way of your desired exhaust vent idea? Do you have access to above that ceiling area?

I got only the piece's I needed at Menards, All B-vent. I got a transition piece from the back of furnace to B-vent, then 1 elbow, a fire stop, and 1 straight 5ft piece. I don't have any answers for you, but I'll show you how I did mine.

 

[peteymit]

Yes the unistrut is in the way of my desired path. I'll have to look at my codes again but I didn't remember seeing anything.

I have the kit and a thimble from Menards, although I think I might need a fire stop instead.

Sent from my SM-N960U using Tapatalk

 

[eddieK]

Do not do this if you don't follow all the codes.

The termination must be at least one foot above the peak, if it is within 4' of the peak. also it must be 4' and/or 10' from a rising wall, at least 10' from an operable window - search out local code. The instructions with the heater will tell you the minimum total flue height, most times it is 5' from firebox connection to top of cap minimum. 1"clearance from combustibles, strapped appropriately, no tape or screws at 'B' vent connections. For every foot you run horizontal (horizontal is not 90 degrees it is 45 degree slope/rise) you must run 4 foot vertical. There are adjustable 1' fittings, 45 and 90 elbows, 6" - 12" 18" 24" 36" 48" and 60" sections. Buy the ones that work so you correctly vent it and terminate it. You can return the items you don't end up needing.

Look up venting tables or get someone that knows the code. This is not something you want to get wrong.

 

[peteymit]

Just got off the phone with the inspector. He said 1" from combustibles includes walls. So I can come back the 18" length as long as my vertical portion is at least 75% longer than that. Which it has to be anyway, as I have to have at least 5' vertical from the appliance according to code.

Sent from my SM-N960U using Tapatalk

 

[Pruittx2]

my local building code for appliance vent height was at least 24" above the structure 3 ft away. I studied all local codes, and built to them or better. Don't want to give that insurance man any reason to deny a fire claim, god forbid. Or upset the inspector.

 

[biggziff]

Call your insurance agent.
The building inspector you spoke with has no clue as to insurance rules.

"insurance rules"? wtf is that?

Follow the IFGC and you'll be fine. Here's something that may help.

https://inspectapedia.com/chimneys/B-Vent-Chimneys.php

 

[biggziff]

You're wrong and being myopic.
Some of us had to prove professional installation just as I said.
You suggest he doesn't make the simplest of phone calls?
Why?

I didn't suggest anything of the kind.

If anyone follows the IFGC they will have no issues with code or other inspectors. It's the way it works.

Read your homeowner's policy. There are NO exclusions of coverage for DIY, unpermitted or other work. 99% of HO policies are HO-4 or better which means if the event isn't listed in the list of exclusions, it's covered...period.