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.
Multiply the furnace's input rating by its efficiency. For example, if your furnace had an input rating of 200,000 BTU's and an efficiency level of 90 percent. You would multiply 200,000 by 0.90 to get 180,000.This number would then be the number of BTU's at which your furnace is effectively operating.or example, if your furnace had an input rating of 200,000 BTU's and an efficiency level of 90 percent. You would multiply 200,000 by 0.90 to get 180,000. This number would then be the number of BTU's at which your furnace is effectively operating.