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Almost Banned Once
Join Date: Feb 2009
Location: Adelaide South Australia
Posts: 38,315
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Clean bench help.
Laminar flow clean bench.
I'm planning to build something like this. I've got some HEPA filters and aluminium tubing and plastic plug in corners for the frame. I just have to settle on the size and whether to use plastic or glass for the sides. (solid rear rather than glass) I was thinking of using a small toilet or bathroom extraction fan to drive the air through the filters and enclosure. (with a variable speed controller) Mine will also have sealed fold up doors on the front to keep it clean between uses. I would appreciate any incite on thing to consider or include. Should I push the filtered air down from the top or from the rear? What's better? I'm hoping the nuke guys will chime in.  Also... Is it worth getting a small air speed meter for testing??? ($20 on EvilBay)   
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- Peter Last edited by sc_rufctr; 10-06-2011 at 04:29 PM.. |
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10-06-2011, 08:14 AM
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Detached Member
Join Date: May 2003
Location: southern California
Posts: 26,964
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Off the top of my head, I don't think a bathroom fan will push very much air through HEPA filters. Any specs of the filters themselves? Most use a manometer to measure pressure drop to indicate when it is time to change the filter media. How "clean" do you want? What are you putting together, a Rolex watch or a carburator?
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Hugh |
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10-06-2011, 08:40 AM
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AutoBahned
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how important is laminar flow & how laminar?
what speeds? what is your background in this stuff? |
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10-06-2011, 12:27 PM
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Senior Member
Join Date: Jun 2000
Location: N. Phoenix AZ USA
Posts: 28,943
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What in the world are you working on there? Hard drive repair at home?
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2013 Jag XF, 2002 Dodge Ram 2500 Cummins (the workhorse), 1992 Jaguar XJ S-3 V-12 VDP (one of only 100 examples made), 1969 Jaguar XJ (been in the family since new), 1985 911 Targa backdated to 1973 RS specs with a 3.6 shoehorned in the back, 1959 Austin Healey Sprite (former SCCA H-Prod), 1995 BMW R1100RSL, 1971 & '72 BMW R75/5 "Toaster," Ural Tourist w/sidecar, 1949 Aeronca Sedan / QB |
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10-06-2011, 02:54 PM
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abit off center
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I need a paint booth like that!
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______________________ Craig G2Performance Twinplug, head work, case savers, rockers arms, etc. |
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10-06-2011, 04:25 PM
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Unregistered
Join Date: Aug 2000
Location: a wretched hive of scum and villainy
Posts: 55,652
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A clean bench is a sign of a sick mind. Oh wait, what?
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10-06-2011, 04:59 PM
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Registered
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HEPA's require decent fans with higher static pressure than what a bathroom fan will probably provide. Depending on how "clean" you want, you may need to perforate the bench deck for adequate flow-thru to avoid particle collection in the stagnation areas near the rear of the bench. I would look for some fan-filter units (FFU's) that integrate a fan and HEPA together in a common case, and then hang a couple on a frame above your workbench. Vertical down-draft hoods generally keeps things cleaner.
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10-06-2011, 07:22 PM
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Registered
Join Date: Jan 2007
Posts: 11,758
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Easier to use large particle filters and vent to the outside.
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10-09-2011, 03:02 AM
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1969 and 1986 Porsche Targa and Coupe 1720cc and 3
