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20" X 22" X 1" Permanent Washable Filter *Listed filter size is nominal. Actual filter size is up to ½" less on all dimensions. These quality filters are built to last a lifetime. They are interchangeable with 1" disposable filters and can be used again and again. The secret behind the filter's performance is its patented stage loading/peak and valley design. Instead of face loading (particles captured on the outer surface of the filter) the filter uses stage loading, with each stage capturing progressively smaller particles inside the filter. This design enables the filter to maintain its performance over the years. Unlike some permanent air filters, the filter uses no foam that may clog, degrade and restrict air flow, so it can provide a lifetime of dependable service. And there are no metal parts that could lead to corrosion or oxidation within the filter. KEY FEATURES: . Never have to hassle with disposable filters that will end up in a landfill . Easy to install-installs like any disposable filter . Easy to maintain-no need to buy oil sprays or adhesives to enhance filter effectiveness . Easy to clean-simply backwash every month with cold water.no expensive air filter cleaners needed . Factory made to fit-no hassles or problems cutting and sizing adjustable filters . MERV Rating - 5 . Full Warranty Framing: High density polystyrene designed for strength and durability. Physical properties: Non-corrosive and non-conducting. Layer A(Front): Polyethylene webbing designed to hold fabrics in framing under high velocities of air flow. Layer B: This patented first layer has a proprietary peak and valley design with large openings to allow maximum air flow with filtering capabilities to capture larger particles. Made of high density polypropylene, this layer starts the electrostatic reaction that holds particles to the fabric. Layer C: Eggcrate design made of polystyrene material. The physical properties of this glass-like material are its strength, stability and electrostatic holding capabilities. Layer D: Medium mesh peak and valley design containing material made of high density polypropylene. This is the third layer of filtration material designed to hold particles in valleys allowing air flow through peak areas. Layer E(Back): Fine material, tightly woven and made of high density polypropylene. This final layer provides more stage loading to help the filter capture some particles as small as .5 to .6 microns.

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