• Seals furnace filter opening Two-piece overlapping construction Improves indoor air quality Saves energy One-size fits up to 25 in filter slot openings-easy to install Can be used as a marketing tool-factory printed with the company name, logo and phone number, contact factory for details Helps achieve a net zero energy building Made of strong but flexible plastic-long-lasting Both the US department of energy and energy star recommend sealing the filter slot Faster, easier, less expensive

Smart filter seal is a durable yet flexible high-strength film designed to fit tightly over the air filter slot on the return air plenum and prevent air from bypassing the filter and thus improve indoor air quality. Magnets surrounding the perimeter hold it tight against the plenum to prevent air leakage. It can be easily removed to change out dirty air filters and replaced again. The 2009 edition of the International Energy Conservation Code (IECC), section 403.2.2 states, "sealing all ducts, air handlers, filter boxes, and building cavities used as ducts shall be sealed." The smart filter seal fulfills that requirement. Both the U.S. Department of energy and energy star recommend sealing the furnace slot.