[Shop-talk] Furnace Filters

[David Scheidt]

> On Dec 13, 2021, at 16:20, Jim Stone <1789alpine at gmail.com> wrote:
> 
> The company that installed my HVAC system a few years ago used a filter box on the return line that takes 20” x 25" x 4” filters, which is an unusual, and thus expensive, size - filters generally run about $25 each - that is not readily available other than online.

Is there a reason you aren’t using a washable, reusable filter?  That’s what four inch housings are for, usually. 

If you install two 1” filters, put the cheap on as the prefilter. 
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