Re: Pressure at gauge at the wall

Posted by Rod (NH) on October 07, 2004 at 15:44:16 from (64.140.200.138):

In Reply to: Re: Pressure at gauge at the wall posted by Frank Stalfire on October 05, 2004 at 19:09:03:

Frank,

I am not convinced the 3M unit should properly be referred to as a "fresh air" unit. As far as I can tell it is a powered air purifying respirator (PAPR). That means it uses ambient air (with the isos in it) and forces that through a filter to the facepiece. I guess it would be better than a standard cartridge mask since, assuming the flow is high enough, the mask is under a positive pressure. Not sure about a hood since they usually require more flow than a mask. But - and it's a big but - one still has to deal with cartridge pre-filters and cartridge units and the issues that go along with decisions on a replacement schedule. There really is no decent substitute for a fresh, supplied-air system in my opinion. Far better to use air that is breathable to begin with than have to rely on filtration devices and their maintenance (or lack thereof) to remove/process the bad stuff. Besides, a decent facepiece will probably run around $200 or more. I think I paid about $180 for my full face mask (mask only) 25 years ago.

Follow Ups:

• Re: Pressure at gauge at the wall Frank Stalfire 20:11:21 10/07/04 (0)

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