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Old 02-27-2012, 08:35 PM   #1
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Need electrical advice, please!


Hi guys, I am a newbie to this site, but I was hoping someone could help help me solve a slight issue that i am having. I am building a small paint booth for airbrushing, and am planning to use a 12 volt blower motor that I found from an unknown toyota car to exhaust the paint fumes through ducting out a window(I really want to use this fan because it has a sealed external motor). I tested the fan with a 10 amp battery charger which spun the fan fine, with plenty of air movement. I am currently trying to run the fan on AC power from a plain wall outlet in my house, but so far i have found nothing to do so. I tried a small AC to DC converter which didn't meet up to the amps needed because the fan didnt even stay in constant motion, next I tried a laptop adapter that put out 6 amps at 20 volts and had the same effect as the last. If anybody has any tips as to how I can make this work, please help me out! I am very good with cars, but nothing close to an electrician. Thank you in advance for any and all advice!

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Old 02-27-2012, 08:47 PM   #2
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Not a great plan. Your really need a 110 volt fan with an TEFC exposion proof motor. Not likly a car fan will be able to move enough volume of air.
You also need to come up with a filter system before that fan.

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Old 02-27-2012, 09:04 PM   #3
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I do have a good filter to put over the fan, i just cant figure out a decent way to power it. From the research i've done i'd say that the fan moves atleast 150 cfm, which should be ok for me right now since im not painting a whole lot. Explosion proof fans seem pretty hard to find in such a small sizes, and im not willing to pay the price for one right now.
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Old 02-27-2012, 11:00 PM   #4
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The motor should have a nameplate rating on it which tells you HP or Watts. 1 HP = 746 watts. Watts volts (12 in your case) = amps. You might have to dig into covers to find it. Don't ever try to run a 12v fan with a 20v supply - you probably ruined the motor when you did this.
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Old 02-28-2012, 03:02 AM   #5
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You're going to have to find an ac - dc converter big enough to run the motor. Must be 12v.
I doubt that laptop supply was putting out 6 amps. maybe 6ma
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Old 02-28-2012, 04:01 AM   #6
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Quote:
Originally Posted by motohead918 View Post
.... Explosion proof fans seem pretty hard to find in such a small sizes, and im not willing to pay the price for one right now.
Are you willing to pay for repairs for damages after you blow your place up? Explosion-proof motors and associated wiring are required for a reason --- volatile fumes tend to be ... well ... volatile!

Call your insurance company and ask them if what you are planning to do is covered by your policy.
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Old 02-28-2012, 08:35 AM   #7
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Use the 10 amp battery charger.
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Old 02-28-2012, 01:51 PM   #8
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This is a bad idea. A DC fan is the worst possible choice, since they ALWAYS spark at the brushes. Bathroom exhaust fans are at least theoretically non-sparking and have been used in diy paint booths. A filter over the fan does absolutely nothing to prevent flammable vapors from igniting, it just removes solid paint particles to protect the fan from getting clogged up.
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Old 02-28-2012, 02:24 PM   #9
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What do you mean "sealed external motor"? Running the motor would most likely be done with a car battery. And if you put a maintenance charger on the battery it would most likely prepare it for the next day. How long at a time would you run it? The biggest concern I would have is if the motor is in the airstream you risk explosion. If it's a blower with the motor isolated from the airstream you maybe ok. But unless the bearing are sealed it won't last long with the paint spray accumulating around the motor shaft.
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Old 02-28-2012, 02:37 PM   #10
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http://www.google.com/search?client=...UTF-8&oe=UTF-8

And full blast the motor/fan could pull 30A.

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