Aprilaire413 Healthy Home Air Filter Whole-Home Air Purifiers, MERV 13, (Pack of 10)

Well made. Fits perfectly.

Quick service and exactly as ordered.

I bought the 4 pack versus the 10 pack.The ad says 10 for $450 at a count of around $34 each.Not sure what math they are using to get that result?It costs more for the 10 pack than a 4 pack.The product, though, is excellent as I have used them for several years in mine and daughter's furnace.

The info says 10 pack of filters for $450, or $34.62 each. Umm, do the math yourself. That comes out to $45each. It pays to read the details, folks. Buyer beware. Otherwise, this is a very good filter!