SPRAY BOOTH FLOW

A place for professionals to network and discuss the business and technology inside the shop.



Fully Engaged
Posts: 290
Joined: Sun Jun 05, 2005 4:07 am
Location: SYDNEY AUSTRALIA
PostPosted: Mon Jun 27, 2011 11:09 pm
HI, DOES ANYONE KNOW HOW TO MEASURE THE AIRFLOW IN A BOOTH? IS THERE AN EASY WAY?
THANKS GUYS
splash it on!
PostPosted: Tue Jul 26, 2011 11:19 pm
there's a meter you can get to measure it.

User avatar

Top Contributor
Posts: 4273
Joined: Tue Jan 13, 2009 7:43 pm
Location: Charleston,SC
Country:
USA
PostPosted: Wed Jul 27, 2011 3:47 am
Whats the CFM flow of your fan?
"The number of parasites in the USA has now eclipsed the number of productive members of society"


Capt Rick Hiott.
www.reelfishhead.com



* Banned *
Posts: 142
Joined: Wed Jul 06, 2011 8:45 pm
PostPosted: Fri Aug 12, 2011 1:48 pm
franco wrote:HI, DOES ANYONE KNOW HOW TO MEASURE THE AIRFLOW IN A BOOTH? IS THERE AN EASY WAY?
THANKS GUYS

I AM GUESSING WE ARE IN YOUR PAINTING BOOTH, WHICH IS WHY WE ARE YELLING, SO WE CAN HEAR EACH OTHER OVER THE HIGH WINDS! ANYWAYS, I WOULD SUGGEST GETTING AN ANEMOMETER FROM EBAY! THE CHEAPEST ONE I SAW WAS FOR LIKE $16! HOPE THAT HELPS!

User avatar

Board Moderator
Posts: 9878
Joined: Fri Oct 20, 2006 12:40 pm
Location: ARIZONA
PostPosted: Fri Aug 12, 2011 2:05 pm
OldDupontGuy wrote:Whats the CFM flow of your fan?


You can calculate it by the above but you would also need to know some other factors.

These formulas are meant to help calculated needed airflow but can be used to figure out what you have as well. Just plug in the numbers you know like CFM output of fans, booth volume (width x length x height), squared footage of exhaust filters, etc.

Scenario #1 - Air moving from ceiling at back of booth to the exhaust filters at far end of booth.
Based on these assumptions:
Surface area (ft2) = 4.4m (wide) x 2.2 m (high) x 10.76 (m2/ft2)
= 102.4 ft2
Air velocity = 102.4 ft2 x 100 ft/min

= 10,240 ft3/min
Scenario #2: Air entering at ceiling and moving downward toward the filters immediately above the floor along the sides of the booth.
Based on these assumptions:
Surface area (ft2) = 6.6m (long) x 4.4m (wide) x 10.76 (m2/ft2)
= 312.5 ft2
Air velocity = 312.5 ft2 x 50 ft/min

= 15,625 ft3/min
1968 Coronet R/T


ACTS 16:31

User avatar

Top Contributor
Posts: 4273
Joined: Tue Jan 13, 2009 7:43 pm
Location: Charleston,SC
Country:
USA
PostPosted: Fri Aug 12, 2011 7:36 pm
If you know the square footage of your booth,,there is a formula you can use to figure out what size CFM fan you need.....................
"The number of parasites in the USA has now eclipsed the number of productive members of society"


Capt Rick Hiott.
www.reelfishhead.com



Top Contributor
Posts: 1665
Joined: Mon Oct 04, 2010 11:31 pm
Location: Northeast
Country:
USA
PostPosted: Sat Aug 13, 2011 10:09 pm
Most garages we built were 12'x18', with walls approx. 9' 6" high, and approx. 12'-13' height at the ridge. So if you could make a ceiling, whether permanent or temporary at approx. 7.5' high, (Shouldn't need more that that), in a garage that size, you'll have a volume of 12'x18'x7.5'= 1620 cu. ft.
Take into account resistance from filters. You could get gable fans or hot air/AC units that will change the air in an area that size, every 1.5-2 min. If you want to change the air faster, use two fans. Two new 1500 cfm gable fans will cost about $165-$170 including tax from Home Depot and will change the air in less than a minute. You could probably buy them used for under $100.
Bear in mind, with air flow like that, you'll have to make a solid effort to keep the area dust free.

User avatar

Settled In
Posts: 13
Joined: Wed Dec 29, 2010 3:44 pm
Location: Eau Claire, Wisconsin
PostPosted: Mon Aug 15, 2011 12:50 pm
The CFM of the spray booth can be determined by multiplying the average air speed (feet/min) through the filters by the area of the exhaust filters (ft2). The air speed can be determined with an anemometer. Using the anemometer, measure the air speed just in front of the exhaust filters. Select multiple measurement points evenly spaced across the exhaust filter wall. The more points you pick, the more accurate the estimate of average air speed will be. Average the air speed measurements and multiply that value by the open area of the exhaust filters.
Melissa Fochs
Global Finishing Solutions
www.globalfinishing.com



Settled In
Posts: 86
Joined: Mon Sep 12, 2011 10:50 am

Country:
USA
PostPosted: Mon Sep 12, 2011 11:32 am
call a local supplier or installer they have a meter they can check it with MAKE sure you have an average size car in the booth when they do it it does matter i have proved it. Then if it needs adjusted they can change your pully's or if you have dampners they will show you how to adjust them and remember it will change as your filters get dirty.

Return to The Pro Shop!

Who is online

Users browsing this forum: No registered users and 31 guests