Review on 🌀 Nordic Pure 20x25x4 Pleated Furnace Filter by John Bailey

Excellent Product. We have been using this brand of filter in our oven for 4 years and change it every 6 months. international industry standard. This standard is used to determine the ability of filters to capture and retain dirt and dust within specific size ranges. A MERV score of 12 means that the average particle size efficiency in microns is 1.0 - 3.0 80 - 89.9%, 3.0 - 10.0 90% or more. Filters with a MERV rating of 9 to 12 are used in commercial and industrial applications and retain particles as small as 1 to 3 microns. These filters are a great choice for homeowners who want to get the most out of dust. I rarely have to sweep up the dust. I think this is a very good MERV for most homes and buying a higher rated filter would be a waste of money as our filters rarely look used when we change them.