About This Filter Replacement: Pack of 8 carbon booster filters designed to replace Holmes AER1 HAPF30AT HAP242-NUC filters for the AER1 air purifier. Odor and Smoke Removal: Effectively removes odors, smoke, and volatile organic compounds (VOCs) from the air. Dimensions: Each filter measures 9.5 x 4 x 0.25 inches ensuring a perfect fit for the Holmes AER1 air purifier. A pack of 8 pre filters. Suggest to replace every 3 months the most to optimize the performance Easy to install. Just remove the used filter from the air purifier and put in the new one. Suggested to replace the filters every 6 months to optimize the efficiency. Quality meets or exceeds leading national brand's Overview Brand : Nispira Material : Felt Product Dimensions : 9.5"L x 4"W x 0.25"Th Compatible Devices : Bionaire Air Purifier: BAP260, BAP815, BAP825, BAP9200, BAP9700, BAP520, Holmes Air Purifier: HAP242-NUC, HAPF300AH-U4R, HAPF30AT-U4R, CAP531-U, CAP529-U, HAP240, HAP242, HAP412, HAP422, HAP424, HAP706, HAP716, HAP9240, HAP9242, HAP9412, HAP9414, HAP9422, HAP9424. Bionaire Air Purifier: BAP260, BAP815, BAP825, BAP9200, BAP9700, BAP520, Holmes Air Purifier: HAP242-NUC, HAPF300AH-U4R, HAPF30AT-U4R,… See more Item Weight : 0.06 Kilograms UPC : 603803224385 Number of Items : 8 Manufacturer : Nispira Product Grade : Replacement Parts Unit Count : 8 Count