3M Filtrete 20 in. W X 25 in. H X 1 in. D Pleated Air Filter

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 Air Flow direction has been changed (redesigned maybe) with the a stronger stretched wires first and the pleated material second. In addition, the paper each is reversed. I installed them (I have two AC systems) and could see they worked just fine. My question is was this redesigned to improve performance or was this a mistake in the manufacturing process? Can you explain this new design? [This review was collected as part of a promotion.]