Review on Honeywell FC200E1037 Air Filter Replacement by Jorge Maertz

These filters from Honeywell filter smoke as expected. During last summer's California wildfires, I upgraded my MERV 11 AC/stove filter to a Merv 13, expecting it to be better at filtering smoke particles. I bought Merv 13 universal filters which had no markings when I received them just white cardboard on the outside. Recently, during a smoky period, I tested my all-purpose filter by measuring PM2.5 and PM10 at the inlet and outlet ports. No difference! These generic Merv 13 filters didn't filter anything! I just installed this Honeywell Merv 13 filter and checked the inlet versus the outlet and saw a definite improvement in air quality. The numbers jump wildly, but one pass through the filter reduces particle density by about a third. I'm not an expert, but I believe that the air in the house goes through the filter several times an hour, which means that the air quality should be improved really quickly. Why do these versatile filters get high marks? I think because no one can figure out how to tell if they really work, that's why they just like them because they're cheap.