Code issues for OAK floor/wall penetrations?

[Kipling79]

I am in the midst of a project that will involve an exhaust fan, and just realized that I will probably want to install an Outside Air Kit on my wood stove in order to avoid any sucky issues.

The easiest and most obvious path would be 90deg down from side of the stove, through the tiled floor "hearth" into my utility room, then 8' to an outside wall.

I am confident that I can penetrate the hearth floor safely by: cutting the hole, buying or making a metal thimble that overlaps the tile and also covers the sides of the hole where subfloor would be exposed, and using high temp sealants.

I have researched though, and don't know the answer to this question: are there any codes that would prevent such floor/wall penetrations inside of the "non-combustible" zone around the stove?

I definitely don't want it to be an issue if I ever sell.

 

[stoveliker]

No there are not.
Oaks best go straight down, so they best gonas you intend to do.
As long as the hole has non-combustible pipe in it, and is sealed, you're good.

I'd simply use silicone. It should not get hot with outside air in it - unless your stove requires a hearth with R value?

 

[xman23]

I assume there is some benefits to to OA. I believe it was a solution to a tight house where the stove didn't draft well. Do you really need it?

 

[stoveliker]

He mentions an exhaust fan. Assume that big enough to need an OAK

 

[Highbeam]

Oaks have benefits even in a leaky home.

Mine goes through a hole in the hearth straight down. Permitted and inspected. I used metal hvac ducting for the stub painted black and grouted around it with the same mortar I used for the hearthstones. No cracks, looks good. Then from that stub to the stove I used a metal flexible dryer vent duct.

Once the loading door is closed I can run all the exhaust fans with no smoke issues. With the loading door open those fans can still suck smoke out.

 

[Kipling79]

I assume there is some benefits to to OA. I believe it was a solution to a tight house where the stove didn't draft well. Do you really need it?

Most codes require makeup air ducting if you plan to exhaust over 600cfm. My DIY "whole house fan" will be doing almost that much, although mainly in the summer.

I will be adding a makeup air source, but don't want to risk the chimney becoming my makeup air source, even partially.

 

[Kipling79]

Oaks have benefits even in a leaky home.

Mine goes through a hole in the hearth straight down. Permitted and inspected. I used metal hvac ducting for the stub painted black and grouted around it with the same mortar I used for the hearthstones. No cracks, looks good. Then from that stub to the stove I used a metal flexible dryer vent duct.

Once the loading door is closed I can run all the exhaust fans with no smoke issues. With the loading door open those fans can still suck smoke out.

This sounds like what I planned in my head. I hadn't decided on a thimble of some sorts, but the mortar idea has me thinking! Sounds like a good way to keep accidental coals out of crevices.