I can only have an opinion about the fact that it looks like a filter. It has not gotten cold enough to turn the furnace on, yet. But thanks for asking.
Good Morning I finally reached the point of needing to change out my filter. With sadness I must say your size is too big. It hangs over. Not sure what wrong. Because this size is the size I usually buy. But I'm in need of full refund. And to send these filters back to you. Thank you. For your help. Leslie Baldwin
I am very pleased with the filters Thank you. They last longer than the ones that came with our system. My only problem with the filters is our furnace is in the attic and I have to go up the ladder to put the filters in and I'm not the spring chicken I used to be. but I'll survive Thank you again for a great product