The MSAK 95 O/M filter, sized at 4"x24"x18", is a versatile air filter by Koch Filter Corp, sold in packs of 4. This filter is designed for optimal performance in various air handling systems, featuring a 95% efficiency rating. Its construction includes a gasket for a secure fit, ensuring no bypass of unfiltered air. The dimensions make it suitable for both upstream and downstream applications, enhancing air quality in commercial and industrial settings. This filter complies with industry standards, providing reliable performance and longevity in demanding environments.