Paint extactor fan

Bill from Scotland · Mar 17, 2018

Im just re-doing a small part of my workshop and plan to install a paint extractor fan but not sure where to locate it. Im thinking somewhere low down but maybe its best highter. Any thoughts welcome.
Bill

showcrop · Mar 17, 2018

Commercial paint booths grates in the floor that draws the air through ducts to a blower in the wall. Downdraft ventilation. You want it as low as possible.

Stephen Newell · Mar 17, 2018

You have to be careful with a fan and paint. An electric motor creates a spark inside which can ignite the paint. I have a spray booth fan which has a explosion proof motor. It's safe around paint. I have also used a furnace blower which had a separate motor and located the motor away from the fan with a series of belts. The blower was located in a small spray booth. This system wouldn't help spraying paint out in the room where the paint could get to the motor. It might be necessary to put a hole through the wall of the building and put the motor outside.

As far as where to locate the fan close to the floor would be best. You not only have paint in the air you also have dust so you want that going below what you are painting.

David G · Mar 17, 2018

You will want filtered air from above and extract low so dust settles.

I would also be concerned about an explosion from a fan, get one that is explosion proof.

Huskergreen · Mar 17, 2018

I would like to add a couple questions about a shop designed paint booth. Would a crop drying fan with a sealed motor work? How much air flow is needed? Can you have to much air flow? If you have grated pit, how long should it be, or what surface area? Bill, I hope the responses to these questions will also help you in your project.

Stephen Newell · Mar 18, 2018

I could be wrong but I think the crop drying fan isn't sealed well enough for paint. I think it's just sealed enough to keep dust out of it. For the most part you can't have too much airflow however you don't want to create a wind tunnel either. In an actual paint spray booth there is so much air being pulled through it you can feel the pressure when trying to open the doors and they are full of air filters instead of solid.

glennster · Mar 18, 2018

the pit in my spray booth at the shop is about 4 feet deep, 3 ft wide and id guess 18 feet long. main burner is 1.5 million btu. has a 10 hp 3 phase motor driving the input fan and the same on the exhaust. the booth is pressure balanced to run positive pressure per epa specs. we run 98 % efficiency filtration. we have filters on inbound and outbound airflow. 3 inch high pressure natural gas fired burner. we spray at about 84 degrees and bake at 145 degrees. we can crank the booth up 170 degrees , but never do that.

Paint extactor fan

Bill from Scotland

Member

showcrop

Well-known Member

Stephen Newell

Well-known Member

David G

Well-known Member

Huskergreen

Member

Stephen Newell

Well-known Member

glennster

Well-known Member

Similar threads