AC Infinity Inline Air Filter Box w/ MERV Filter - 100MM (4" Inch)The AC Infinity Inline Air Filter Box 100MM (4") is engineered to deliver reliable air purification for both residential and hydroponic applications. Built with 1mm thick SPCC cold rolled steel and powder coated matte black finish, it offers durability and resistance to harsh environments. Equipped with a high efficiency pleated MERV filter, this unit effectively captures dust, lint, pollen, dirt, odours, and even fine particulates as small as 0. 3