6" x 24" or 24" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 26.5"] 14in diameter + Product Details Size – Suitable for all AC 8in diameter 12125SDCLNGBX

+ Product Details Size – 36"w X 20"h is the size for the duct opening measurement only

ensuring it fits most standard thermostat models

Energy Efficient – Air-tight inner core decreases the pressure loss and provides a more hygienic environment - high energy efficient / No fiberglass erosion into air stream

Actual Filter Size – 31 3/4"w x 31 3/4" x 1"

6" x 24" or 24" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum White [Outer Dimensions: 8.5" X 26.5"] 14in diameter + Product Details Size – Suitable for all AC 8in diameter 12125SDCLNGBX + Product Details Size – 36"w X 20"h is the size for the duct opening measurement only ensuring it fits most standard thermostat models