We offer a unique and patented magnetic frame design that allows a prefilter to stick to the outside of steel air intake louvers, meaning that they are accessible from the outside with no need to dismantle the case to retrieve filters for cleaning. Magnetic stripping can be attached to the steel filter frame with adhesive. When measuring for a magnetic backed filter model, keep in mind that the metal frame must extend 1/2 inch over the inside edge of your intake opening on all four sides, and rest on a flat steel surface. We also offer a flexible vinyl edging containing magnetic stripping for attachment to a metal grid system or steel cabinet. Patent No. US 6,793,715
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