Specifications include, but are not limited to: a Pleated Filters: Shall be a minimum of MERV 6 per ASHRAE Standard 52.2. he pleated media shall be constructed with 100% synthetic material and must stand up to rough field handling conditions. The initial pressure drop shall not exceed 0.28” w.g. FGI NOVA Pleat, Series 400 Pleat or approved equal. b. 2-Ply Panel Filters: Shall be constructed of two distinct layers of polyester media permanently heat-sealed around a sturdy internal wire-frame. The media shall be non-allergenic, unaffected by moisture, humidity and most corrosive chemicals. The media will not support the growth of fungus or bacteria. Airflow 2-Ply Panel or approved equal. c. 3-Ply Panel Filters: Shall be constructed of three distinct layers of polyester media permanently heat-sealed around a sturdy internal wire-frame. The media shall be non-allergenic, unaffected by moisture, humidity and most corrosive chemicals. The media will not support the growth of fungus or bacteria. Airflow 3-Ply Panel or approved equal. d. Rigid Polyester Pad: Shall be constructed of 100% polyester fibers that are resilient, water repellent and chemical resistant. It shall be rigid enough to be used without a frame in most applications. FGI Rigid AM or approved equal. e. Paper Paint Arrestor Pads: Shall be fabricated of slit and expanded paper with multiple layers. The air intake side shall have larger openings with smaller openings on the exhaust side to provide depth loading for maximum service life. Research Products 3000 Series or approved equal