Field Controls 46600405 Model 4 Merv 11 HVAC Flex Filter, 16" x 25"/20" x 25", Red Replaces ALL major brands Installs in seconds and is easy to store Replaces Honeywell POPUP1625 16 x 25 x 4, FC100A1029 16 x 25 x 4, POPUP2025 20 x 25 x 4, FC100A1037 20 x 25 x 4