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Find a value pack of high quality replacement furnace filters from SpiroPure. SpiroPure pleated AC Furnace filters are made in the USA and are the perfect choice for most standard residential and light commercial air conditioner and furnace units. MERV 11 rated filters are the perfect efficiency upgrade for homes that contain pets cigarette smoke or other additional pollutants. The 85% or better efficiency of particles sized 3 to 10 microns with the added 65% to 89% of particles sized 1 to 3 microns means that MERV 11 filters are an excellent choice for those who suffer from asthma severe allergies and other respiratory related illnesses. A dirty filter restricts airflow which can put too much strain on the system. As a result there can be motor burnout and an overheated system. The leading cause for HVAC system failure is a dirty air filter.