MERV Rating How To Determine Merv Rating For Furnace
If you want to get into the numbers: a MERV 8 filter has about a 0.3” w.g. pressure drop (clean) vs a MERV 13 which has 0.4” pressure drop. blowers are rated for their maximum CFM at .50″ of static pressure. Ductwork should have a pressure drop of .20″. If an air conditioning ...