Fume ventilation

[pringa8]

Hey guys, i'm still in the planning stages, and one of the things I'm still not sure about after reading posts here is whether I've got the correct fan, and whether I need an 'in' fan or just some sort of opening to allow air in?

I'd plan to only run it while welding, etc. I'm imagining these 12" holes in the side letting all the heat out! Or is most of the loss just through the ceilings anyway (I plan on insulating the walls and ceiling).

This is the exhaust fan I was planning on using. Any advice from people who've installed these or knows a bit about airflow/fume ventilation would be greatly appreciated!

http://www.globalindustrial.com/p/h...1ph-variable-speed-aluminum-shutters-9ft-cord

 

[lonestarky]

How much welding are you planning on doing? Probably not necessary for an average amount...just crack the garage door and run a box fan?

If you're seriously safety conscious, that fan is probably fine, but I would check the cfm compared to the cf of the room, you would want the room air to turn over quickly, maybe every 15 min? I'm sure there's an osha guideline.

Relative to an "in" fan, no, you don't need one. Depending on how much negative pressure you generate, the fan may hold a door open. I would imagine you have roof vents, soffits, windows, etc. All of those things will let air in.
http://www.greenbuildingadvisor.com/blogs/dept/musings/designing-good-ventilation-system

https://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&p_id=9853

2000 cfm is the osha std, you're close at 1846

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[matt_i]

There is also a "fume extractor" with a flexible tubular arm. Donaldson Torit makes one, it uses some kind of filter elements to capture all of the welding smoke. These don't require an outside vent.

It depends on how often you are going to weld, what kind (stick obviously makes the most smoke, tig the least) and if you are burning thru paint, oil, etc.

In my 25x25 shop if it gets too smoky I just leave for awhile. The smoke is gone when I return.

 

[Cyberbear]

In my woodworking shop I installed a ceiling mounted 36" fan that had no problem removing dust or fumes in seconds, as needed, from the entire work space. Rather than just blowing the toxic welding fumes all around, you may wish to consider a dedicated portable exhaust fan with flex hose ducting, and blow those fumes outside your building or welding area. Better to avoid lung damage rather than worry about a little warm air loss.

 

[strutaeng]

Hey guys, i'm still in the planning stages, and one of the things I'm still not sure about after reading posts here is whether I've got the correct fan, and whether I need an 'in' fan or just some sort of opening to allow air in?

I'd plan to only run it while welding, etc. I'm imagining these 12" holes in the side letting all the heat out! Or is most of the loss just through the ceilings anyway (I plan on insulating the walls and ceiling).

This is the exhaust fan I was planning on using. Any advice from people who've installed these or knows a bit about airflow/fume ventilation would be greatly appreciated!

http://www.globalindustrial.com/p/h...1ph-variable-speed-aluminum-shutters-9ft-cord

I had a 10" model of this in my old house, in a 2-car garage. It was marginal. I did occasional welding and small paint spraying. Like already mentioned, crack the door to get some cross-ventilation.

It was certainly better than nothing. A "fume extractor" is a welding vacuum with a hose, very expensive and used in industrial environment.

From experience, I'd go with the maximum CFM you can afford.

 

[sberry]

Holding a door open is a good way to tune the draw some.

 

[brycez28]

I have a 12" gable fan in my 1 car garage that I turn on while welding, and I crack the overhead door open (opposite side of garage). It has no problem pulling the fumes out.

In the summer, I leave the fan run all the time. It keeps my garage on average 5-10 degrees cooler than the outside temps turning the day. My garage is partially insulated and not in "direct" sun most of the day.

 

[vartz04]

I was helping my BIL figure out a cigar room and they say 12 air changes an hour for that for 2-3 smokers. Not sure if it directly matches up with garage fumes but it's a start.


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[pringa8]

I thought I'd lost this post! Thanks for the input everyone, it's been very helpful. I'll go with the fan to err on the side of caution and crack the door for in flow. Much appreciated. Love the cigar analogy vartz

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[LS6 Tommy]

You will lose some heat with any exhaust system. You could also get a 12" fan wit ha barometric damper like that for quite a bit less...

Tommy

 

[pringa8]

You will lose some heat with any exhaust system. You could also get a 12" fan wit ha barometric damper like that for quite a bit less...

Tommy

Haven't found those, got any examples?

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