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 <li...@rtty.us> wrote: From: Bob Camp <li...@rtty.us> Subject: Re: [time-nuts] Fan filters To: "'Discussion of precise time and frequency measurement'" <time-nuts@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-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Mark Sims Sent: Wednesday, September 15, 2010 11:47 AM To: time-nuts@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 _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
