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New spray room

2/18/23       
Tony

I have been fortunate to be able to expand to a new shop space. Unfortunately, I have to Rework everything that has worked for 28 years. I have to build a new spray room and do not have a true booth. The new space will be 15x22x10' high ceiling. I have looked at posts on how to figure the cfm of air movement/fan size but am still confused on the true numbers needed, as well as how to do the wall and baffles. I do intend to divide the space with a wall with about a 5' opening and use one space to actually spray, and the other space for flashing/drying before going back into the shop. I envision a sliding door there, with filtered make up air.
We build custom cabinets and furniture and primarily spray conversion varnish. I intend to buy a tube axial fan and filter media. Given the "opportunity" and the space I have, how would you proceed building a new spray area? Any advice and suggestions are appreciated, especially in regards to fan size, plenum construction, etc, if not always fully understood! Thanks

2/18/23       #2: New spray room ...
Leo G Member

Length times width x 100 feet per minute will equal CFM of the fan you will need.

2/19/23       #3: New spray room ...
RichC

A variable speed fan is a real bonus. Turn it up while spraying and down while it out gasses. A 3 phase fan motor on a VFD is the cheap ticket. Have a belt driven fan so the motor is out of the air stream is a real plus with the fire marshal.

2/19/23       #4: New spray room ...
mike

i can help a ton on this one. i built a booth to specs & it would have been cheaper to have bought a factory built one if you are building to spec. the factory sets up in few days & you wont have to re-invent the wheel like we did. you can buy a like new used one if you watch the auction sites, marketplace , craigslist. as Rich says the variable speed fan helped us a ton since we started using waterbourne materials. good luck

2/19/23       #5: New spray room ...
mike

this may help also

https://woodweb.com/search.html?Terms=paint+booth&Realm=All

2/19/23       #6: New spray room ...
herb johnson

if you choose to build your own spray a suggestion, use twice as many intake filters as you have exhaust filters, you don't want the inbound screaming thru you intakes, it creates a lot of turbulence and a box of 24, intake filters that have frames and dual layer polyester and a tackified side is worth about 150 bucks, also that the intake air is not powered , meaning you are using suction, not the exhaust filters which is powered suction by your exhaust fan. if you can roof mt the fan, it will be much quieter. remember, that the tacky side faces the inside of the box not vice versa. good luck herb j

2/19/23       #7: New spray room ...
Tony

Thanks for all the responses. After reading them and researching more, think I may be misunderstanding the cfm formula. So it's not L x W x H of the total room, but width x height of the wall? And if that's the case, does the filter area have to be the full size of the wall? I appreciate your help.

2/19/23       #8: New spray room ...
mike

this mite help you.
https://www.hunker.com/12387444/how-to-calculate-cfm-for-a-paint-booth-exhaust-fan

2/19/23       #9: New spray room ...
herb johnson

here is what i recommend as far as exhaust filters, go to website like global finishing and look for a booth side height and width and in the specs for booth you will see the number of filters that there booths contain, that is what i did and it worked out great. also width x height of booth if your plans want a ten wide ten high booth x 100 ft per min, then it comes to 10k worth of air.......
however just my two cents here, with high effeciency spray eqpt like air assist not talking hvlp, i think about 70fpm or so is plenty to move the solvents etc nasties away from you without creating a wind tunnel effect but i am no engineer nor safety official fwiw.......have a nice night herb j

2/20/23       #10: New spray room ...
Leo G Member

The open area that the fan will be pulling air from is the LxH that you measure. If you put the fan behind an area that is 9' tall and 10' wide you would need a 9000 CFM fan. 9x10x100fpm

2/20/23       #11: New spray room ...
CraigM

Depending on where you are located, it might be a good idea to talk to your local building inspector before you start to build anything. There's been a few self built booths around me that have been shut down because they did not build to NFPA33 rules, so make sure your plan is conforming or you could run into code / insurance problems.

2/21/23       #12: New spray room ...
Chris

What do you plan to do for heat? Most common is a gas fired air make up unit.Provides balanced amount of air and heat as needed


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