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Can I vent spray booth fumes into a crawl space?

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  • Member since
    July, 2003
  • From: Chicago, USA
Can I vent spray booth fumes into a crawl space?
Posted by MonsterZero on Tuesday, February 14, 2017 10:50 AM

There is a crawl space under the house accessible by a floor hatch.

There is nothing but gravel and pipes in the crawl space.

Can I drop the spray booth exhaust hose into the crawl space and get rid of paint fumes like that?

The spray booth has a filter so I will be just venting gasses down there.

  • Member since
    October, 2008
  • From: Fullerton, Calif.
Posted by Don Wheeler on Tuesday, February 14, 2017 11:27 AM

I wouldn't want to blow flammable or toxic vapors under my house.  But, if you extend the hose and route it to an outdoor exhaust it might be OK.  If the run is too long, it might affect the flow rate, and that's not a good idea.


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  • Member since
    November, 2003
  • From: Newington CT
Posted by tempestjohnny on Tuesday, February 14, 2017 11:30 AM
Does the crawl space have airflow? Meaning is there vents leading to the outside. If yes I don't think you would have an issue but if no then it could build up over time


  • Member since
    July, 2014
  • From: Meridian, ID
Posted by modelcrazy on Tuesday, February 14, 2017 11:45 AM
There are typically no flammable sources in a crawlspace and if the area is ventilated I don't see why not2 cents


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  • Member since
    April, 2016
Posted by GlennH on Tuesday, February 14, 2017 12:43 PM
Where is your furnace located? Are there return air ducts under the floor in that space?

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  • Member since
    January, 2013
Posted by BlackSheepTwoOneFour on Tuesday, February 14, 2017 12:44 PM

If it typically gets really hot under there, I say no to be on the safe side. IF... you have sort of a vent leading outside, I see no reason why you can't.


Again, it all depends what you got going on underneath in the crawlspace.


Don't you have a window near your airbrush spray booth you can vent out from?

  • Member since
    March, 2013
Posted by patrick206 on Tuesday, February 14, 2017 12:46 PM

With acrylic or water based products, likely no or very limited risk factors. However, if like me you commonly use lacquer or enamel paints, I'd say no.

Even with acrylics, the most used cleaners are alcohol or lacquer thinner, when spraying that rinse agent through the AB an explosive/flammable material is now entering a questionable area.

As well, with those mentioned cleaning agents there would be environmental considerations, like vapors possibly entering the living area over time.

If the end result is uncertain, probably best to not allow any risk to be present. Just my thoughts.


  • Member since
    March, 2007
  • From: Northeast WA State
Posted by armornut on Tuesday, February 14, 2017 1:11 PM

If you plan on selling your home I wouldn't, over time that chemical smell gets into the wood and insulation and may never come out, kinda like a house that has un kept pets. Safety first! Wide open spaces.

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