6'' X 20'' Charco Filters Plus Activated Carbon Air Filter6" x 20'' Standard Carbon Air Filter. This filter eliminates 99. 5% of all odors using 100% Virgin Activated Carbon. It features a pre installed flange and has a 180F maximum operating temperature. This lightweight filter has an average life span of 1. 5 years. Activated Carbon inside is what sets our filters apart from the competition. Designed specifically for indoor gardening, our filters will purify the air and eliminate any odors. These high