Overspray attracted to paint booth intake filter?

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PostPosted: Sun Apr 14, 2019 3:49 pm
I built a paint booth in my garage. It has a fan blowing air into a duct I build across the top on one side. The duct has air filters on it to filter the air going into the booth.

The air is certainly blowing into the booth. When I turn the fan on, the plastic sheeting blows up like a balloon. I would expect the air going through the filters to blow air away from them... but instead I've got overspray landing on the filters. Check it out in the pictures below. And when I flick the filter with my finger, a little cloud of overspray poofs off of it.

https://photos.app.goo.gl/b6k6XyQftpDWjDca7
https://photos.app.goo.gl/K1coDkS6kNY3L3xv7
https://photos.app.goo.gl/uEJFFLDDUWBLdZcH8

Here is a video of the ventilation and overspray:
https://youtu.be/dKLJUzUDBYo

Is this a problem? Not sure what design flaw is causing this...

This is the fan I have:
https://www.northerntool.com/shop/tools ... HFEALw_wcB



Thanks,
Sal

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PostPosted: Sun Apr 14, 2019 10:28 pm
Where did you get this booth layout from???
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PostPosted: Sun Apr 14, 2019 10:28 pm
Is the fan blowing in from one end of the ducting where the filters are?
If so it will create a suction from the air rushing past the filter nearest the fan.
You may need to put a small diverter(s) in the duct to direct some airflow out through the first filter or two.
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PostPosted: Mon Apr 15, 2019 6:16 am
It is home-made based on hours of internet research :) It seemed like air blowing in from the top of one end and out through the bottom of the other was a common enough design.

The air is blowing into the duct from the left side of the intake filters. Behind the intake filters is a box that is about 16 inches tall (height of filters) and 12 inches deep.

I see what you are saying about the air blowing past the first couple filters and creating something like a venturi effect to suck air. But strangely the overspray dust is on all of the filters, even the ones on the far end.

One thing I've considered is to add a pre-filter to the blower fan. This should slow the air down a bit and maybe help things.

Thanks!

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PostPosted: Mon Apr 15, 2019 8:10 am
I guess I'm just not a big believer in this type of homemade booth. To me the filters "after" the fans are kind of pointless. Also, a fan with that kind of output is not moving much air through that booth. It is indeed more like "inflating" the area or pressurizing it but not moving or taking the overspray anywhere..... still kind of scratching my head over how this could work.....
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PostPosted: Mon Apr 15, 2019 8:52 am
The booth seems to work well at removing overspray. I can see it moving in the air towards the back end of the booth. And I can see where it has been blown out of the gaps in the door.

It also serves as a "clean room" to paint in and the positive pressure keeps stuff from blowing into it. It is much better than painting with the garage door cracked open from the bottom (my old method). And the booth keeps overspray from getting all over everything else in my garage.

That said, I do see some overspray settling on top of the masking plastic I have on the car. So clearly all of the overspray is not being removed...

But I guess in this situation some ventilation is better than none.



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