![]() These filter banks should be about the size of the end wall (8 x 10). The length of the booth does not matter here - just the cross section that you are pulling the air through. The fan draws air through the inlet air filter bank through the booth (8 x 10 cross section) through the exhaust air filters and out through the stack. The exhaust and inlet filter banks go at opposite ends of the booth. When you say, "If you get the right fan (one with the motor out of the air stream).", do you mean that the motor would be on the outside of the booth or in a housing inside the booth? What do you mean by ".just keep the cross section down"? I was planning on placing the intake higher up (where the air is cleaner) on a west wall and the exhaust down low on the east wall (where the fumes collect). If you get the right fan (one with the motor out of the air stream), you will only need a TEFC motor, not explosion proof. 75" static minimum in the middle of the fan chart range. Select a fan with the CFM rating you want at about. Grainger has a good fan selection for spray booths. (24 x 24 filter frames are bolted together to get the size you need.) You will need inlet and exhaust filters of this size. Anywhere from 100FPM to 300FPM will work. To size the filter bank depends on how often you want to change filters. Does not matter how long the booth is, just keep the cross section down. This means a booth 10ftw x 8ft tall (80squft) moving at 100FPM will require a 8000CFM fan. The correct way to size a fan for a booth is to move the air across the product at about 100 to 150 ft/min. This will give you the CFM (cubic feet/min) that your fan must exhaust. The formula for sizing a fan is the square footage of your exhaust filter area x 125 ft/min. They have a very wide variety of filter media. We have been spraying WB for about 3 years in our garage and never had a complaint.Īn excellent source of filters is Chemco Manufacturing. I will also agree that once you switch to WB your neighbors should not complain. You will probably have to use several filters to fit the 8' x 8' area. Where do you get a filter to fit an 8' X 8' (or 8' X 4') opening? ie if you don't feel a breeze, you don't have enough air movement.īy the way, I use Enduro and like it very much. My understanding (beware a faulty memory) is that OSHA requires something like 100cfm of air blowing past you as you spray. You may need close to a 48" fan for a booth as big as you're suggesting. I checked a site and for their 8'x10' booth they use a 2hp 24" fan that pulls 6400cfm. Check out commercial booth sites to see what they need in their booths. You need a lot of air for your booth to work well. When spraying something 8 or 10 feet wide, I'm not generating enough airflow to really capture the overspray effectively, so I think I will add a second fan for these situations. I had an old explosion-proof motor which was used for the fan, and it worked fine for the smaller pieces or anything that fits in front of the filter area. So the opening to the booth is 12' wide by 8' high. I have 8' by 4' wide main filter area, with a 4' by 8' high plywood flap on each side that opens to make a funnel effect. I did exactly what you are planning about 6 months ago. Your neighbors won't complain with the Enduro (or probably any water-based lacquer). but this might require some ducting, which can be expensive. also, you want to draw the spray downward onto your work and not up and away from it. Since most spraying is done at table top height, I would consider locating the exhaust fan lower down so that the main airflow is at work height. I think (from previous messages) that you need a minimum of 35 cfm per sq. How large of an exhaust fan do I need? Does anyone have a reference to how much air needs to be moved based on square footage? I plan to have a filtered intake opening high on one wall and a filtered exhaust opening on the opposite wall. Therefore, I plan to switch to waterborne products (Enduro poly) and to build a 12' x 16' spray booth. My shop is in my backyard and a neighbor complained about the smell of the precat that I use.
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