The genuine OEM Lennox X5422 MERV 11 20x26x3 Pleated Air Filter is designed for use in the Lennox PCO-20U and other 20" x 26" x 3" whole-house media air cleaners.
X5422 replaces previous Lennox X1184 furnace filters.
Approximately 20-1/8" (20.125") x 26" x 3"
Lennox X5422 Box Media Filter Compatible Model/Part Numbers:
- X5422, X542201
- X1184, X118401
- PCO-20U, PCO-20U-1, PCO-20U-2, PCO-20U-3
- DLXX5422