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20 x 25 x 4 Air Filters for AC/Furnace..
#15
A plenum is just a fancy word for ductwork. You have the intake plenum where the filter is and the exit pleum where the ducts take the air from the furnace and deliver it to the rest of the house.
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Here's a free Filtrete A/R from 3M - by Psurfer - 11-27-2007, 04:29 PM
Re: 20 x 25 x 4 Air Filters for AC/Furnace.. - by JoeH - 11-28-2007, 12:17 AM

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