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 Energy Efficient – Air-tight inner Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

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 front end outer dimensions are approximately 10 5/8" width X 8 5/8" height

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

actual front end outer dimensions are approximately 16 5/8" width X 12 5/8" height

ensuring it fits most standard thermostat models

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 Energy Efficient – Air tight inner Compatible With Duct 7in Applications This sheet metal DDAG A 1212 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 front end outer dimensions are approximately 10 5 8" width X 8 5 8" height