From: "John Grabowski" 
Newsgroups: alt.home.repair misc.consumers.house
Subject: Re: HVAC custom-size air filters
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Date: Thu, 29 Nov 2007 19:27:09 -0500
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 wrote in message
news:ab99d671-3177-4621-8080-282be64948be@w34g2000hsg.googlegroups.com...
> Can someone recommend a source for custom-size air filters for
> residential HVAC?
>
> I need 1"x25"x22" filters, and the closest sizes I've seen (at my
> local WalMart, HomeDepot, Lowe's) were 1x25x25 and 1x25x20.



Grainger sells filter rolls so you can cut your own size.  Maybe you can get
a sheet metal shop to fabricate a frame for you.  http://www.grainger.com

http://www.grainger.com/Grainger/categories/hvacr/filters/filter-media-rolls

You could try a plumbing supply or HVAC supply company as well.