18" X 8" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 20 5/8" X 10 5/8"] 18in diameter If your duct opening is

If your duct opening is 14 inches in diameter

5" - SEE BELOW IN DESCRIPTION How To Measure A Grille

actual front end outer dimensions are approximately 25

actual front end outer dimensions are approximately 26 5/8" width X 18 5/8" height

Design – Unrestricted airflow for your HVAC system - adjustable one-way louver with full horizontal airflow directional control - single deflection supply grill with 96% airflow - noise free components - no vibrating louvers etc

18" X 8" Steel Return Air Filter Grille for 1" Filter - Removable Frame - [Outer Dimensions: 20 5/8" X 10 5/8"] 18in diameter If your duct opening is+ Product Details Size 18"w X 8"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 20 5 8" width X 10 5 8" height Actual Filter Size 17 3 4"w x 7 3 4" x 1" High Quality High quality solid stamped steel with counter sunk screw holes (screws included) and no sharp edges Installation Location Sidewall and ceiling Design Removable door face for easy filter change & cleaning uses a 1" thick filter. Our