From: professorpaul 
Newsgroups: alt.home.repair  misc.consumers.house
Subject: Re: HVAC custom-size air filters
Date: Fri, 30 Nov 2007 13:25:52 -0800 (PST)
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I had the local HVAC outfit make me a washable filter. A trip to the
hose/shower once a month, and a whiff of spray on filter oil. No more
replacable filters. Cost was only $10!