Patent ID: 8398752

Claim:
A method for filtering air, comprising the steps of: (a) providing an air filter; and (b) introducing the air filter into an air flow, such that the air filter filters the air, wherein the air filter comprises: (a) a frame; and (b) a non-woven textile filter media disposed in the frame, the nonwoven textile filter media comprising a needle-punched wadded mass comprising longer fibers and shorter fibers, wherein the shorter fibers range from 5 to 55 mm in length and make up a substantial majority of the wadded mass and the longer fibers range from 60 to 100 mm in length and make up a minority of the wadded mass, the longer fibers and shorter fibers being polyester fibers, wherein the polyester fibers comprise a combination of about 1.5 denier fibers and about 4 denier fibers, wherein a ratio of 1.5 to 4 denier fibers is between 1:1 to 1:4, and wherein the non-woven textile filter media exhibits a Minimum Efficiency Reporting Value (MERV) of about 8 without requiring electrostatic treatment, and a pressure drop of 2.9 PSI or less.