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Bob F Bob F is offline
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Default is it always better to use a thicker filter in furnace?


"dpb" wrote in message ...
james wrote:
My furnace was installed with a 16x20x1 pleated filter.

It looks like there is enough space to fit a 16x20x2 filter. This should last
longer and reduce air resistance.

Is there any reason not to?


How can doubling the thickness _reduce_ resistance?


It doubles the surface area.