I recently bought the 1900, 16 x 20 x 1 filter for my upstairs furnace. I have forced hot air, and since I began using it I noticed that I don't have as much dust around the house as I did with my previous filter. I will continue to purchase the same filter in the near future. However, the cost per filter is a little pricey, but after the rebate, the cost for each filter was a better value.