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Reply by Cooler

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Posted on Spray room ducting question

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Cooler

299 posts in 1041 days


#1 posted 08-22-2016 03:19 PM

I converted my old dark room (photography) into a spray booth. It was set up as a “clean room” to minimize dust (an even more worrisome issue in photography than spraying.)

To accomplish that I have filtered air blowing into the room. I have outlets into the shop. There are several reasons that this is a better setup than running an exhaust fan.

1. Minimize explosion hazard. If you run an exhaust fan then the fumes will pass directly over the motor and sparks could ignite the fumes. You have to use a very expensive shielded fan for this application. But by blowing air into the room the fumes do not pass over the motor and it is much safer.

You will have to run ducts (clothes dryer vent material will be fine) to the exterior.

I simply cut a 14” x 14” opening in the wall and using bungee cords (2) I mounted a 20” box fan with a furnace filter between the wall and the box fan. The filter (a 3M very fine filter) cost as much as the fan, but about $30.00 total.

2. The second reason you don’t want an exhaust fan is that it tries to suck dust into the room. Exactly what you don’t want. With the positive atmospheric pressure caused by the filtered air forced into the room it will push the dust out, instead of sucking the dust in. I always turn on the fan before opening the room’s door.

Also, because housekeeping is important to keeping dust down, I ran a shop vac hose through the wall of the room. I turn on the intake fan first and I keep the vacuum cleaner outside the room. The hose inside the room is used to suck up any dust or debris. It would be an actual disaster to run the vacuum in a clean room environment.

-- This post is a hand-crafted natural product. Slight variations in spelling and grammar should not be viewed as flaws or defects, but rather as an integral characteristic of the creative process.


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