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What is the Lennox Air Cleaner Model HCC20-28 replacement furnace filter?

Lennox X6673 MERV 11 also know as the HCF20-10 (previously MERV 10) or the HCF20-11 is the correct replacement filter for the Lennox HCC20-28.

The Lennox X6673 20x25x5 actual size: 19 3/4 x 24 2/4 x 4 3/8 can also replace the following Brands Air Cleaner Filters.

Lennox X6673 20x25x5 MERV 11 Original Filter Replacement HCF20-16 Sale $32.99

X6673 Original Filter Sale by Atomic Features great pricing on 1 pack and 2 packs of the X6673 20x25x5 MERV 11 Original Filter Replacement HCF20-16 starting at $32.95. for a 1 pack of the OEM filter by Lennox, Atomic also carries a high quality compatible made in the USA sold as a 2 pack for $49.95.