27140 County 6 Fountain, MN 55935: 27165 County 6 Fountain, MN 55935: 27223 County 6 Fountain, MN 55935: 27241 County 6 Fountain, MN 55935: 27276 County 6 Fountain, MN 55935: 27821 County 6 Fountain, MN 55935: 28823 County 6 Fountain, MN 55935: 29420 County 6 Fountain, MN 55935: 29559 County 6 Fountain, MN 55935: 29739 County 6 Fountain, MN 55935: 30270 County 6 Fountain, MN 55935
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.
Tip. 1  Replace filters every month or when you can no longer see through the filter medium. 2  The filter air box or the furnace proper will always contain the correct filter measurements for replacement filters. 3  Look for a panel sticker on the inside of the filter air box door or on the inside of the furnace access panel.. Locate the filter. On most furnaces the filter will be directly adjacent to the furnace. The filter box may be covered by a small and wide hinged door, or the filter itself will be visible inside a notch that it slides into.