The Koch Multi-Flo is a rigid, extended surface air filter engineered to provide medium and high efficiency air filtration, and long filter lifecycles. The Multi-Flo, because of its rugged metal and plastic frame construction, is capable of operating in a wide variety of air handling systems, and is an excellent product for variable-air-volume (VAV) applications where changes in airflow might render a non-rigid filter ineffective. Koch Filter® Extended Surface Air Filter, High Efficiency Rigid, Series: Multi-Flo™ Series G, 24 in Width, 12 in D, 24 in Height, MERV: MERV 14, 2000 cfm, 180 °F, FM Style, 90 to 95% Efficiency, 0.68 in WG Initial Resistance, 1 in WG Final Resistance, Microfiberglass Media, White, Domestic