great filters, low air resistance, lots of media area.
Your review: I took the filter out of my air handler and fit one of these at the return air grill in the house (a little oversized but that means it will last longer before needing a change). This way it prevents dust and allergen build-up in all the air ducts. The high efficiency filter also keeps the air handler coils clean and efficient. In ten years using these filters, the air handler coils are as clean as they were the day they were installed. I change the filter about every 3 months