Garage exhaust fan.

[Chadwilliam1]

I have a finished garage with attic access but I plan to do some welding in my garage I want some air movement. In my last garage i had a skylight I kept open with a box fan tied to it I would turn on to vent out any smoke or dust. It helped with the heat in the summer, a little bit.

Any suggestions on fan to vent out through the attic?

Thanks Chad

 

[Falcon67]

This is what I did with a powered 1600 CFM attic vent fan. It's for general venting of the car area to help move the stink out after running one of the hot rods. Works well enough.



I used AC vents so I could close up the hole when not in use.

 

[Chadwilliam1]

do you have a link to where you got the fan. Now that you have me thinking that would be pretty cool if I could start a car with door closed. I do have windows so if I had to open a window that wouldnt be bad.

 

[Stuart in MN]

Personally, i'd rather run an exhaust fan out through a side wall, rather than pulling fumes or dust up into the attic. In any case, it's not going to be enough to run a car inside the garage with the door closed.

 

[Jack Olsen]

I have a similar ($80, but only 1,200 cfm) attic fan on my (flat-roofed) garage. I still wouldn't run the engine very long if the car doesn't have a catalytic converter. Get a $20 carbon monoxide detector just to be safe. I was surprised how fact the C0 levels go up when the engine starts.

 

[sixty4]

This is what I did as well. Went out the side, not much welding but some of my old cars were stinking up the place pretty good. I have a timer on it so I don't forget to shut it off.

 

[Chadwilliam1]

I would run it out the side but I have brick and I don't want to mess that up. What about a whole house fan?

 

[Marctrees]

Well sure "Whole house fan" fine if you have the roof OR gable end louvers(that you can get big ones of by Googling).

Otherwise-----

Marctrees
Junior Member

Join Date: Mar 2015
Posts: 11

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[jnkpile]

An old furnace fan (squirrel cage type) works very well! They move a ton of air, fairly quiet and can be found used for cheap.

 

[Ainsley]

You can see in the back right corner I have a direct drive squirrel cage fan mounted that exhausts out the wall directly under the soffit.

It can be turned on and off manually or can be controlled by the call for cooling from my thermostat, as shown here

which looks like this inside:

I've only had it working over the winter so I have not installed a makeup air louver or fan... once the weather gets warmer it is on the list.

 

[pattenp]

I didn't see in your post if your garage is attached to your house. If attached there are fire codes that restrict open penetrations of fire barriers/drywall in garages to attic areas when attached to living area.

 

[Chadwilliam1]

Garage is attached but the attick to the garage is not attached to the rest of the house.

 

[Chadwilliam1]

http://www.coolmygarage.com/shop/gf-14-garage-fan-attic-cooler/


I was looking at this, i have a ridge vent. I could add a few box vents. Right now there is no attic insulation in my garage.

 

[pattenp]

Garage is attached but the attick to the garage is not attached to the rest of the house.

I don't believe it matters if the attic is not attached. Garages attached to living area are to have the common wall and ceiling drywalled to fire specs. Having an open hole in the ceiling with a fan in it violates fire code for garages attached to residences. At least is does if your locality adheres to the International Residential Building Code. You need to verify this with your local building authority. They do make fans with a fire rated auto closing door.

Here's one... http://www.rewci.com/gfgacovesy.html

Edit: Oh, I now see you already looked at this fan.


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[hayhauler71]

dayton 1/3 hp 2 speed fan motor with 2 inch filter box works for me.

 

[donnymcarter]

http://www.fumeavent.com/
http://www.oreillyauto.com/site/c/search/Garage+Exhaust+Hose/N2320/C2328.oap

 

[taumac]

I don't believe it matters if the attic is not attached. Garages attached to living area are to have the common wall and ceiling drywalled to fire specs. Having an open hole in the ceiling with a fan in it violates fire code for garages attached to residences. At least is does if your locality adheres to the International Residential Building Code. You need to verify this with your local building authority. They do make fans with a fire rated auto closing door.

Here's one... http://www.rewci.com/gfgacovesy.html

Edit: Oh, I now see you already looked at this fan.


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If attached garage has a access door with fold out ladder is the door consider a fire break?

 

[James-W]

I have seen a coup0le shops where they had a rather large vent hood with a fan that sucked up all the smoke and blew it outside. The welding area is beneath the vent hood and the fan seems to have an awful lot of suction.

 

[LS6 Tommy]

http://www.coolmygarage.com/shop/gf-14-garage-fan-attic-cooler/


I was looking at this, i have a ridge vent. I could add a few box vents. Right now there is no attic insulation in my garage.

Very much not code compliant. You can't have an attatched garage exhaust fan discharge into the attic. IDK how they can even sell that for that application...

Tommy

 

[alfredeneuman]

If attached garage has a access door with fold out ladder is the door consider a fire break?

No it's not, but in that case there's supposed to be a fire rated wall between the attic in the garage and the attic in the dwelling.

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Anything other than fresh inside air is required to be ducted through the attic to the exterior through the roof or an outside wall.

 

[taumac]

No it's not, but in that case there's supposed to be a fire rated wall between the attic in the garage and the attic in the dwelling.

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Anything other than fresh inside air is required to be ducted through the attic to the exterior through the roof or an outside wall.

That's what you'll see typically in Florida construction. Now for venting with the soffits and ridge vents that you'll see on about every house in Florida act as a vent. I guess also they're counting on that door to be sealed better probably

 

[alfredeneuman]

That's what you'll see typically in Florida construction. Now for venting with the soffits and ridge vents that you'll see on about every house in Florida act as a vent. I guess also they're counting on that door to be sealed better probably

What about when the stair door is open and becomes just a big hole through the ceiling?

EDIT: I just found some fire rated stairway doors.

http://www.stairwayshop.com/Fakro_LWF_22x47_Wooden_Attic_Ladder_FR_7_2_8_11_p/lwf2247.htm

There's a label on them that says they only are fire rated when the door is closed which makes perfect sense because all regular doors between the garage and the dwelling must be solid core (fire rating) and have automatic closers.

 

[taumac]

I was asking cause I know that the garage must be sealed off from garage. I've lived here 30 years and every garage I've seen has some access like a fold down stairs or just a piece of drywall that can be removed to access actic. My fathers house, inlaws house and my house where all built in 1980's and all have that same type fold down stairs from when house was built from the builder. t's not a sealed or fire rated. My question was how did they get around code? The topic came up so I thought I would ask