12 Jul
1998
12 Jul
'98
3:36 p.m.
On Sun, 12 Jul 1998, Joe wrote:
I would be a bit concerned about the pressure drop across the HEPA
filter. Frankly, I am not familiar with them but a vacuum cleaner
(centrifugal) blower is capable of rather greater pressure than a
squirrel cage blower - which is designed for volume and not pressure.
The volume of air from squirrel cage and HEPA could be insufficient to
achieve the desired pressure and flow in the box.
- don
At 12:53 PM 7/12/98 +0100, Tony wrote:
> A plastic
box with a blower and a HEPA filter from one of these new vacuums
> to put clean air in the box at positive pressure. The front would be
clear
with rubber gloves to allow reaching in. level of clean can easily
excess class 100. Adaquate for sophisticated drive repairs.
I had been considering a range hood. The ones with a squirrel cage fan
pull an lot of air and they aren't as noisy as the propeller type fans.