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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.
Electronic furnace filters and electrostatic air filters are for those who have a furnace or central air conditioning in their home or office that uses an air filter. All models below work with central forced hot air or as an air conditioning filter. These are permanent as opposed to the disposable, standard replacement furnace filters for the house. Custom furnace filter sizes available with Guardian and Boair. Installing and cleaning is easy. See our complete selection of Furnace Filters or review the differences in furnace filters between Guardian, Airscreen 500, BoAir, and Envirosept air filters with our Furnace filter comparison chart. Helpful & Knowledgeable Staff.