21x21x1 Air Filter | 4- | 8 Pleated Furnace Filters | Actual Size 21 x 21 x .75

Confirm filter size before purchase. Made to protect your homes accommodating air systems. Air systems like or furnaces need filters in place to keep the incoming airflow free of intruding particles. 8: Most common filter on the market. Applicable in most commercial buildings, residences, industrial workplaces, and paint booths. : Our filters can not only be good for your health but also your wallet. Replacing air filters can save you thousands of dollars in repairs and can lower your monthly energy bills : It is recommended to change the /Furnace filter every 1-3 months. The environment of your filter plays a large part in how long they last and the required frequency of replacement. Air filters in different environments block airborne irritants and prevent complications resulting from lack of filtration. However, while the location is different, the purpose of cleansing the air you breathe is the same. & : Open, Slide and Close. Simple yet effective air filters. For best results, it is recommended to replace your and furnace filters every 1-3 months.