GREAT VALUE: This is a replacement filter for air purifiers, to help effectively filter airborne particles for healthier living. Each filter includes 1 LifeSupplyUSA True HEPA Filter Replacement Compatible with Holmes HAPF30AT Aer1 Total HAP242-NUC Air Purifier (3-Pack). Approximate dimensions are: 9.98' x 4.67' x 1.39' inches COMPATIBILITY: Compatible with Holmes HAPF30AT Aer1 Total HAP242-NUC Air Purifier Filters. Please note that this is not an OEM product. This is a replacement product by LifeSupplyUSA, exclusively for sale by LifeSupplyUSA. QUALITY HEPA: High-Efficiency Particulate Air (HEPA) design will capture very fine particles and irritants. It targets airborne particles such as dust, lint, dirt, pet hair, dander, pollen, and more. USED BY PROFESSIONALS: LifeSupplyUSA Humidifiers Filters are made to be durable & efficient for months. SAVE MONEY by ensuring the maximum airflow supply volume & protecting your device.