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Discussion Starter · #1 ·
I have a furnace with an electronic air cleaner (see Figures). It never worked well, and I was advised years ago to replace the air cleaners with an air filter.

I have been using the filter size shown in the attached 28 1/4 x18 3/16 x 3 3/4. Not a perfect fit, but it seemed to work. I can't find this size any more. What are my options? Custom filters? Those are really expensive. Or should I cobble together a frame that would allow me to use a smaller filter size?

Any thoughts would be appreciated.
 

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Discussion Starter · #3 ·
I thicker filter will fit there, why not standard 4" thick?

If it's not a perfect fit - small gap at top, can put rubber weather seal tape around it to stop air from leaking around.
I can't find a thicker filter that's close to 28'' x 18'', or a thinner filter close to those dimensions. That's the issue.
 
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