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MERV ratings range from 1 â 16 and measurements are in microns. Some of the common particles related to MERV ratings are pet dander, insecticide dust, smog, dust, viruses, wood, tobacco smoke, spores, bacteria and pollen. Some of the most common filters found in residential use only have a merv rating of 1 to 4.
Once you locate the Lennox furnace filter compartment, changing your filter is easy! Simply slide out the used filter and dispose of it. Insert your new Lennox furnace filter according to the directional arrows printed along the frame which indicate airflow. Replace the access compartment panel if applicable. More Information About Lennox Furnace Filters