Lennox X6667 Furnace Filter 21X26X4 MERV 10

The Lennox X6667 is a MERV 10 pleated air filter for your home’s HVAC system to help trap dust, pollen, and other allergens. As compared to flat filters, it has a pleated structure that provides larger area for trapping of particles. This filter is placed in your furnace, the main heating appliance of your air conditioning and heating system. When air movements in an HVAC system, these pollutants are captured into the filter in order to enhance indoor air standard and safeguard the furnace from dust accumulation. This may help to enhance indoor air quality.