Clear The Air Merv 7 filter Removes 75% of dust and airborne particles. The Merv 7 is a great upgrade to "self supported" pleats and low efficiency fiberglass or polyester filters. It has a 43% lower airflow resistance than other Merv 7 filters helping the furnace to run more efficiently and ultimately causing a reduction of energy bills. Clear the air Merv 7 filters are available in 10 sizes so you are sure to find what you are looking for. Clear The Air Merv 7 Pleated Filters are available in 1", 2" and 4" depth. The electrostatically charged 100% synthetic graduated density media is continuously bonded to a 30 gauge galvanized, corrosion resistant, expanded metal support grid with an effective open area of 96%. The media is resistant to a wide range of chemicals, does not absorb moisture and will not support microbial growth. The controlled pleat spacing maximizes surface area and dust holding capacity and is bonded to the enclosure frame to prevent dust bypass. The enclosure frame is constructed of high wet strength moisture resistant beverage board. The diagonal support members of the frame are bonded to the entering and exiting apexes of each pleat to prevent pleat collapse and filter bowing.