Booth air recirculation
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Does anybody know of a link with info on the fan setups in real booths? Or can somebody help me with a few specific questions?
Specifically, how much air is recirculated right back in, and how much is let outside? How is that managed?
Rules of thumb on CFM and air velocity per cubic foot? I’ve seen these numbers before, but am having a hard time getting all the details.
would heat for a booth be possible by simply utilizing a separate zone off the water system in the building? a large heat exchanger in the ductwork of the fan would be relatively simple. or even have in floor heat, if the air is largely recirculated. Just no bake cycle.
I’m always drafting up shop plans, and in the next few years I hope to build a giant shop. I can slowly fill it up with tools. A booth will be a must, and I want a proper downdraft with plenty of light and air. I want to have a couple of suntubes going into the roof of it. Imagine natural light right in the booth!
thanks fellas
some of the higher end booth recirculate on their bake cycle but thats it. other than that a booth exhausts 100% of its air. airflow through the booth should be from 75-125 feet per minute. this is why a downdraft needs bigger more powerful fans. my cross draft moves about 14000 cfm. while a booth is running your shop heat will never keep up with any kind of booth. most have 1.5million or more btu heaters. floor heat would be a great supplement though especially when the fan is off.
Jim’s right on target.
I’ve heard of booths that recirculate a portion of the air during bake cycle, but I’ve never seen one. I would think that most of the problem with recirculating is that you don’t want to have the solvent vapors being placed back into the inlet stream.
I’ve toyed around in my head with that instead of recirculating the air to have a heat exchanger on the inlet to preheat the air with the exhaust making the inlet rise to some extent using less fuel to acheive a set temperature. Just a thought though.
pretty much all booths now a days recirculate on the bake cycle to save on fuel. of course its only a certain percentage that they recirculate. some booths even have an option now to recirculate when you are not spraying
I knew most booths had giant burners, but I thought newer ones recirculated a lot of the air… huh.
what exactly is a ‘scrubber?’ what is allowed into the environment as far as exhaust goes? the rules are pretty lax in AK, but I’m sure there must be something relatively simple to install to improve things on my homemade booth.
Our booth uses 100% fresh air on the spray cycle, but recirculates around 90% on bake, to reduce fuel costs. The 10% fresh ensures removal of fumes etc.
[url=http://www.burntwoodspraybooths.co.uk/spraybooths-cars.htm]A handy diagram[/url]
that little image in there is handy. a nice simple view of the dampers and whatnot.
thanks
Bobwires-
You might want to take a look at our paint booth training website, The Finishing Academy. The site has a ton of information about paint booths, from components and airflow to safety and maintenance. I know there is some pretty specific information on fan setup and CFM in the Spray Booth Basics section. Since you said you are looking to expand your shop, the Building the Perfect Shop section may be helpful as well. There are some neat tools there that you can download and use to help in designing your shop.
http://finishingacademy.com/refinish_training_home.html
– Melissa
[quote=”fochsml” post=19363]Bobwires-
You might want to take a look at our paint booth training website, The Finishing Academy. The site has a ton of information about paint booths, from components and airflow to safety and maintenance. I know there is some pretty specific information on fan setup and CFM in the Spray Booth Basics section. Since you said you are looking to expand your shop, the Building the Perfect Shop section may be helpful as well. There are some neat tools there that you can download and use to help in designing your shop.
http://finishingacademy.com/refinish_training_home.html
– Melissa[/quote]
That is fantastic! Thanks Melissa
[quote=”bobwires” post=19383]
That is fantastic! Thanks Melissa[/quote]
Glad to hear that! If you have any questions about any of the information, feel free to ask me on here or click on the “ask us a question” button on the Finishing Academy question. If I don’t know the answer, I will find someone who does!
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