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Home paint spray booth fan alternatives?

Discussion in 'The Hokey Ass Message Board' started by myke, Feb 21, 2005.

  1. MrMike
    Joined: May 21, 2010
    Posts: 138


    I like to use a box fan with a filter on it blowing into the booth and one with a filter sucking out , try to keep the booth a little pressurize, only trying to clear the fog enough to see what I am spraying not create a hurricane.
  2. Keep in mind that explosion-proof equipment isn't just designed to try and keep explosive vapor/dust away from ignition sources, but also to contain/control any explosions that may occur. An explosion-proof motor won't be explosion-proof unless the connections to it are also properly sealed.

    It's not a good idea to use a non-rated motor as an exhaust fan. As a pressure fan, yes, but not exhaust. You'll get away with it 99.9% of the time, but that .1% can seriously bite you in the ass. There's a whole section in the electrical code about spray booths.

    For guys with home shops, think about this: In any commercial garage/shop where mechanical work is being performed, from the floor up to 18" above the floor is considered a class 1 area and any electrical in this space would require explosion-proof gear. The assumption is any explosive gases would settle in this space. A serious hobbyist's shop could be considered a 'commercial' space by both the local authorities and your insurance company. But above 18" is unclassified, so keeping all electrical above this line will eliminate any need for classified parts. This doesn't apply to spray booth fans; if exposed to paint fumes, they need to be rated.
  3. BradinNC
    Joined: Mar 18, 2014
    Posts: 213


    Box fan blowing in, set on LOW speed, ground car(helps with other issues also), on inside of space if airflow is too noticeable, hang some cardboard to diffuse air flow. Many people have used this method. It's not rocket science.
    And above all use PPE for your own protection.
    PS. If this is a car in running condition, might as well disconnect battery and use neg cable to go to ground rod. then you ensure it is a good ground.
    Last edited: Jun 18, 2017
  4. mamllc
    Joined: Aug 26, 2008
    Posts: 124


    A/C fan motors will typically be of the induction type, which (with very rare exceptions) do not have brushes. There are different types of induction motors. Most box fans use a shaded pole type, which has nothing in it that will create a spark. Many furnace/squirelcage type fans use a PSC (permanent slit capacitor) type, which also will not spark. Split phase or capacitor start motors have a centrifigul starting switch in them and can create a spark. These are all single phase types, if you are lucky enough to have three phase in your home shop, three phase motors also will not spark. Overspray buildup is not going to be good for the internals of any electric motor, filters and/or non vented motors will help there.

    Now.....shaded pole, PSC, and 3 phase motors should not spark, but, anything that is conducting electricity has the potential to become an ignition source, however small the chances may be. Keeping the motor away from the combustible gases will eliminate even that chance.
  5. You don't need brushes to have an ignition source; failing connections, windings or bearings/bushings can all produce either sparks or enough heat to ignite flammable vapors. I've seen some pretty impressive amounts of fire come out of brushless AC motors over the years....

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