Enjoy cleaner, fresher indoor air with the PureAir® HVAC MERV 8 Allergen Filter. This filter captures common allergens and other airborne particles such as pollen, household dust, dust mite debris, carpet fibers, lint and more. The filter traps up to 85% of airborne particles 3-10 micrometers in size. A pleated design, electrostatic dual wire backing, and air flow indicator arrow provides high performance and simple installation. For best performance, replace every 3 months. 20x20x1 filter is compatible with standard residentail furnace, air conditioner, or HVAC systems.