Our Museum furnace room door requires a unique sized air filter. I was able to order the exact size needed; it fits so well that double-wing, flush clips were not needed. :blush:
My HVAC installer recommended that I get the Merv 8 filters for my unit that's now three years old. But we have noticed that we constantly have a fine layer of dust even having had the vents professionally cleaned. Should we be using a higher Merv # to trap more particulates?