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Lennox X6667 Air Filter Overview

Lennox Healthy Climate X6667 Furnace Filter Overview


This filter is the pleated air filter replacement for the PCO-20C air filter cabinet and measures 21” X 26” X 4”. The Lennox X6667 air filter has a MERV 11 rating, which means that it filters out 85% of particles down to 3 microns. This includes – pollen, dust mites, mold spores, some bacteria, dust, and more. This is a significant upgrade from a 1” furnace filter. The X6667 filter should be replaced every 9-12 months depending on the air quality in your home.


Benefits of the Lennox X6667 Furnace Filter

The Lennox Healthy Climate X6667 furnace filter’s MERV 11 rating means your home or business will receive superior contaminant control. Allergens and other pollutants are removed from your indoor air supply to limit your exposure, reducing symptoms and discomfort. This filter is a great indoor air quality solution in homes with allergy and asthma sufferers.

Your Lennox Healthy Climate X6667 furnace filter works to keep your heating and cooling systems running optimally, season after season. The filter allows air to move properly through the system, keeping your equipment performing optimally while maximizing energy efficiency. Contaminants are kept away from delicate components to prevent malfunctions as well as wear and tear.

Changing Your Lennox X6667 Furnace Filter

The Lennox Healthy Climate X6667 furnace filter requires a change every nine to twelve months for optimal filtration and HVAC system performance. You can do this yourself or ask your HVAC technician to change the filter when your heating and cooling systems receive their preventative maintenance tune-ups.

To change your Lennox Healthy Climate X6667 furnace filter:

  1. Identify where the filter cabinet is located – it’s often installed between your furnace or air handler and the return air duct.
  2. Take off the filter cabinet door.
  3. Pull out the old Lennox Healthy Climate X6667 furnace filter and throw it away.
  4. Insert your new Lennox Healthy Climate X6667 furnace filter into the filter compartment in the direction indicated by the arrows printed on the frame.
  5. Replace the filter cabinet door.

Furnace maintenance makes a difference for home heating systems – learn the furnace maintenance facts you should know on the HVAC.com blog.

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