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2008-04-29, 9:28am
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Senior Member
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Join Date: Oct 25, 2005
Location: sunny az...
Posts: 411
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CFM's necessary for my 'barley box'
I have a "barley box" being made up for me and need to know the CFM's necessary for proper ventilation. I can't figure out these CFM calculators I've seen on some other sites.
The box is 17" deep, 30" wide and 30" tall. I'm working on a Cheetah.
Any suggestions? I don't want to create a huge wind tunnel so I'm a little leary just going out and picking up a high CFM fan.
Thanks in advance!! 
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2008-04-29, 9:31am
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da General
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Join Date: Oct 05, 2006
Location: San Francisco
Posts: 13,002
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See below for accurate calculation by Dale!
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Hayley
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2008-04-29, 10:11am
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Senior Member
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Join Date: Oct 25, 2005
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I was told a 700 CFM would do the job using these calculations:
Measure the "face" or opening of the hood, 30 x 30 = 900 / 144 = 6.25 * 100 = 625 CFM minimum. Select a fan from 625 CFM up to about 700 CFM (that's about 10% over).
Right now I have a fan stronger than 443 CFM with a smaller dimension "box" and I can definitely say it's not doing the job.
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2008-04-29, 11:12am
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Gentleman of Leisure
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Join Date: Jun 10, 2005
Location: A Little Bit West of Yosemite Valley
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No, no, no...
Depth of box is not important in equation...
The 30 x 30 dimension of opening is the proper values to use....
30 x 30 = 900 / 144 = 6.25 x 125 = 781.25 cfm...
Even if you go with lower figure of 100 CFM that is considered absolute minimum value its still 625CFM...
Dale
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San Francisco - A Few Toys Short of a Happy Meal
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2008-04-29, 11:14am
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da General
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Join Date: Oct 05, 2006
Location: San Francisco
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Sorry about that . . . Thanks Dale for the correction! My coffee must not have kicked in this morning!
Edited:
I was not crazy. Dale . . . my calculation was based on what Mike Aurelius had used, based on hood SIZE and not OPENING. Hmmmmmm - is he around nowadays to shed some light in this matter? Perhaps I was not understanding his recommendation correctly?
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Hayley
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2008-04-29, 11:48am
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Gentleman of Leisure
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Join Date: Jun 10, 2005
Location: A Little Bit West of Yosemite Valley
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Height and width is the opening (hood size) for a Barley box....
Width and depth is opening (hood size) for a hood...
What ever the situation its all "face opening".....
Think of a box as a hood tuned 90 degrees so depth/width become height/width...
Dale
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2008-04-29, 11:55am
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da General
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Thank you for the clarification, Dale! Appreciate your help, always!
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Hayley
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2008-04-29, 12:16pm
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<--- Time traveler
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Join Date: Jun 11, 2005
Location: Rock Hill, SC
Posts: 2,476
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I got an 800 CFM fan from The Blower Store on ebay, and added a switch to control the speed. It's a refurbished furnace blower, and the price was VERY good. Works perfectly with my Barley Box. I go full blast for enamels, powders, and metal leaf, about about halfway for "regular" glass.
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2008-04-30, 7:40am
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Certified Glassaholic!
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Join Date: Jun 17, 2005
Location: In my own little world.....
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Courtney,
Would you be so kind as to post a link to the ebay seller you purchased the blower from? I tried searching Blower Store and couldn't find anything on ebay.
Cheers,
-Yee
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2008-04-30, 8:11am
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<--- Time traveler
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Join Date: Jun 11, 2005
Location: Rock Hill, SC
Posts: 2,476
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I think ebay makes it too difficult to search by store name. Also, he's changed his name a little bit:
http://stores.ebay.com/THE-SQUIRREL-...Q3amesstQQtZkm
He doesn't have anything up right now, but if you get in touch with him and tell him what you're looking for, he will make it available for sale if he can. He has 1200 CFM sizes more often than 600 and 800, but you can always have someone install a solid state speed control and not run it at full blast. Also, ask about the amps of the fan you get, to be sure you can run it with the power supply you have. I am able to run my 800 CFM fan on household supply with a "regular" outlet. Also, you'll need to match the speed control amps to the fan amps. I still have a couple of extra speed controls around here somewhere; let me know if you need one.
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