AIR FILTER 20X20X1 3PK

Been searching high and low for a polyester filter that flows as free as possible. Too many people get hung up on what the filter will filter out and forget that a furnace has to breath too. Otherwise the blower motor works too hard and is more apt to burn out as well as the a/c a-coil being more prone to freeze up. Do some internet research. My furnace has a static pressure issue ( more furnaces do than people realize) and wanted something better than the spun fiberglass filters that dont really filter- you can pour salt right thru them. This filter fits the bill... The merv 5 rating (3m equivelant of 100 in their rating system) is the only merv 5 that the big box stores sell in my area. Just wish they would go back to the standard 'boxed' framework that seals so much better. Give them a try and see if you dont get better airflow thru your discharge vents and save on your bill sinc ethe blower dosent have to work so hard.

The Basic air filter is poorly designed, having the wire support on the intake side of the filter material. It used to be on the back side, and whoever made this change must have made a mistake. A strong airflow can pull the filter material off the support wires, and into the blower, if the filter is installed per the arrows on the frame of the filter. I'll turn my filters over, so the support wires are on the outgoing side. Next time, I won't buy 3M filters.