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The Abatement Technologies H101 is the 20 x 25 x 1 MERV 4 OEM replacement pre-filter for the CAP100 Air Purifier.
Abatement Technologies recommends you change the H101 1st stage filter every 1 to 3 months for proper operation.
This package ships with Twelve (12) filters.
Actual Filter Dimensions: 19 5/8 x 24 1/8 x 1