[TheForge] positive pressure room

[Kathy]

Hi Jay,
I always thought the rule of thumb was that to move fumes you want high volume
fans, but to move particulates (like grinder dust) you need high speed fans.
Since paint involves both, what kind of machinery do you employ? BTW, thanks
again for your contributions about handling copper tubing fittings in Gas
Burners.
Mikey_

-----Original Message-----
From: theforge-bounces at mailman.qth.net [mailto:theforge-bounces at mailman.qth.net]
On Behalf Of Jay Hayes
Sent: Thursday, March 08, 2007 7:45 AM
To: Sponsored by ABANA
Subject: Re: [TheForge] positive pressure room

A down draft exhaust near the grinder will give you the best removal of 
the dirty air. If you want the shop to be positive pressure just size 
the makeup air fan to move more air than the exhaust fan. You might want 
the makeup air fan to be two speed so it will kick into high when the 
exhaust fan is on.

I've got a three extra down draft benches that I'm thinking of selling. 
Two are six foot long and one is sixteen feet. I'm now using one of my 
old spray booths as a grinding room.

Jay

Dan Scheid wrote:
> Well I get to build a shop. It's going to be 24'X36' and I'm thinking of
> making a "grind" room with a positive pressure to try to get the dust out.
> My thoughts was to pipe a old swamp cooler in and vent it out from under the
> grinder. Do I need to put a blower on the out? Any input to make this work.
> Cheep.
> Thanks
> Dan Scheid
>
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