What a HUGE relief to find the EXACT size filter needed for an old school type furnace. AND even better, I was able to get the highest MERV rating my furnace can use to help clean the air in my home. During cold, flu & Covid season an extra little bit of peace of mind.
I use the merv 11 filters in locomotive cab HVAC systems. They are double stacked and work great filtering out not only dust particles but whatever exhaust particulate enters the cab.
Love these filters. Have many pets in the house so we change our filters more than most. The fact these filters are an American product is a big plus. The prices are awesome. Thank you for a great American product.