Air Filters Made in the USA. Free S&H on most products to most of the mainland US.

Rigid Cell Filters

The Smith Rigid Cell has been engineered to provide high-efficiency filtration combined with prolonged life cycles. It is an ideal choice for variable air volume systems. Being totally rigid, it’s performance is not affected by changes in air velocities or system shutdowns. The high surface area to depth ratio provides a maximum amount of effective filter media in areas of minimum in-line duct space. The Smith Rigid Cell is available in four efficiency ranges, Merv 14, Merv 13, Merv 11 and Merv 9. It is available in a box type (without a header) and also in a single header style. It is designed for use in a wide variety of applications including hospitals, office complexes, and industrial facilities. High-density microfine glass available upon request.
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