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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. This is because the 70% to 85% efficiency of size 3 to 10 micron particles that comes with a MERV 8 filter is perfect for removing airborne contaminants without impeding the airflow in your HVAC system. SpiroPureMerv 8 Pleated Filters remove the following household contaminants: Lint & Dust Dust Mite Debris Pollen Mold Spores Pet DanderWe recommend replacing your furnace filter every 3 to 4 months for maximum efficiency and cooling and heating system life. 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.