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Furnace air filter, 16x25x4 (actual size 15-1/2" x 24-1/2" x 3-3/4") PUROLATOR key Pleat extended surface pleated air filter, mechanical MERV 8 by Sterling seal & supply, Inc (stucco) (2-Pack). PUROLATOR key Pleat air filter, supplied by Sterling seal & supply is a standard capacity pleated filter, available in 1", 2" or 4" depths and several standard face sizes to accommodate most system requirements. A seven-strap die cut is located on the air-leaving side of the key Pleat MERV 8 providing additional strength and durability to each filter. The inside of the die cut frame is coated with adhesive to ensure a solid bond at all points of contact with the media Pack. The Pack is sealed inside the frame and Pleat tips are bonded to the stabilizers and diagonal support members. ** facts about home and business air filters, allergies, and filter quality ** when looking to replace your air filter, there are typically two different sizes you need to understand, "actual size and nominal size". first: the actual size consists of the true dimensions of your filter when measuring Length, width and depth (thickness). these dimensions typically include a fraction of an inch within them. For example: 19 1/2 x 19 1/2 x 3/4 second: what you might not realize is that filters are not sold by their actual dimensions. Instead a rounded up number is used to Label filter packages. This measurement is referred to as the "nominal size". third: so a filter with actual dimensions of "19 1/2 x 19 1/2 x 3/4" will have a nominal size of "20 x 20 x 1", and that will be the measurement to look for when buying your replacement filters.