Designed to fit most 20 in. x 25 in. x 4 in. boots; actual filter size 19.75 in. x 24.875 in. x 4.375 in. So confusing :) Any thought on 3M vs Honeywell?
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By anonymous on 08/03/2020, 12:30 PM EDT
Just make sure you understand it is not 4 inch but 4.375 - make sure your system can accept it.
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