Carrier FILXXFNC0017 16x20x4 MERV 8 Replacement Furnace Filter - 2 Pack

As good in construction as the more expensive filters that I bought for years, and the Atomic Filter cost less also.

Fit perfect, didn't have to change anything or do anything different. It is now performing it's duty.

For me the actual size is more important for a better fit than the nominal size when I order.