[time-nuts] Fan filters

paul swed paulswedb at gmail.com
Wed Sep 15 19:24:41 UTC 2010


Well not sure 36 ft would last a life.
It would rot like the original.
The answer has to be very available like taking aircon filters apart from
home depot.
69 cents each 2 X 3 ft...

On Wed, Sep 15, 2010 at 1:26 PM, Robert Atkinson <robert8rpi at yahoo.co.uk>wrote:

> Hi.
> As you have identified, it's reticulated foam that we need for this
> application. From memory I'd say the 35 pore per inch size is close to what
> HP used. It works out at about 0.8mm pore size. Reticulated foam is
> interesting. It's made from closed cell foam were the walls are either
> dissolved out or they make the foam with an explosive gas in the cells and
> then ignited. One other use is to stop explosions in fuel tanks.
>
> Robert G8RPI.
>
> --- On Wed, 15/9/10, Bob Camp <lists at rtty.us> wrote:
>
>
> From: Bob Camp <lists at rtty.us>
> Subject: Re: [time-nuts] Fan filters
> To: "'Discussion of precise time and frequency measurement'" <
> time-nuts at febo.com>
> Date: Wednesday, 15 September, 2010, 16:52
>
>
> Hi
>
> Any idea which of the pore size choices (30 through 100 ppi) is the closest
> to what HP used? 36 square feed is pretty much a lifetime supply. Buying a
> chunk of each would have you set forever...
>
> Bob
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Mark Sims
> Sent: Wednesday, September 15, 2010 11:47 AM
> To: time-nuts at febo.com
> Subject: [time-nuts] Fan filters
>
>
> Both Philmore and Keystone (and lots of others) sell fan filter kits.  They
> have a grill and the media.
>
> These people are cheaper than most:
> http://www.arcade-electronics.com/SearchResult.aspx?KeyWords=fan%20filter
>
> But for $25 or so you can get 36 square feet of the stuff:
> http://www.airfiltrationprod.com/media.html
>
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