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Spray Booth Extraction


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I wasn't sure wether to go for the finishing section or in here...ah well..here goes.

I'm starting to set up my spray booth now, and I'm looking for some advice from those who've done it before. My booth will be a 6x8 foot shed, and I'm going to need an extraction system, of course.

I know about the worry of sparks so will be using a fan with it's motor out of the airflow, but I'm still not sure how to work out exactly what flow rate to look for. I'm getting conflicting information from different websites - with some calculations I could get away with around 320CFM of airflow, and with others it's 6000!

I'm also somewhat stumped on how to heat the booth, as I'll be drawing air directly from outdoors it's going to be a tricky process!

Any help will be most appreciated.

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Make sure you use air filters on your intake vents. You can use an oil filled electric raditor to heat the room.

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Make sure you use air filters on your intake vents. You can use an oil filled electric raditor to heat the room.

Yeah that was the only thing I could think of really. I'm considering trying to draw air in past whatever heating system I have to take the chill off it if I'm spraying on a colder day

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  • 2 weeks later...

Expensive paint booths use heated air inlets, some way of re-using the extracted air to avoid wasted heat, etc...

But I just could not afford such a high tech spray booth for my guitar repair business.

So I just bought the biggest explosion proof exhaust fan I could find :-)

It's 3phase 380V and draws something like 15A when running.

I made a big filter screen in front of it (filters are replaceable) and added side walls, ceiling and a door.

(You can also buy complete extraction units under the name "extraction walls" in my country. They come as +/- 2mx3m walls with filters mounted and 1 or more fans.)

I use filtered air inlets.

By closing or opening some of the inlets allows me to regulate the airflow.

This is very handy sometimes.

For heating the paint booth I use an explosion proof "infrared heater" when the exhaust fan is running.

Instead of heating up the air, it warms up the objects in the spraybooth (that's me) so even in cold winters it's always nice and warm for me to spray guitars.

Don't point these infrared heaters directly at guitars, especially acoustics, use them only during spraying and try to hang the guitars away from the heaters direct field when drying/curing.

It can cause air bubbles in freshly painted guitars and cracks in acoustics if you keep it pointed at a guitar for too long.

After spraying I switch the big fan off and switch on a small exhaust fan that keeps running the whole day to extract the fumes from the paint curing.

I also switch of the infrared heater as soon as possible after spraying and use a normal radiator that runs whole day long to keep the paintbooth at a comfortable temperature in between spraying when the painth is curing.

PS: always keep an eye on the humidity gauge when heating a room during the dry winter :-)

Hope this helps...



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