16" X 20" Steel Return Air Filter Grille for 1" Filter - Removable Frame - Black - [Outer Dimensions: 18 5/8" X 22 5/8"] Filter Grille this grille is a testament RFG3024 Black HP const content item Hi-Lo Oval Stack Head

this grille is a testament to high standard craftsmanship

you can watch this informative video tutorial: How to Measure Your Vent Hole Before Ordering a Grille

+ Product Details Size – 12"w X 36"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 10 5/8" width X 16 5/8" height

Actual Filter Size – 7 3/4"w x 15 3/4" x 1"

16" X 20" Steel Return Air Filter Grille for 1" Filter Removable Frame Black [Outer Dimensions: 18 5 8" X 22 5 8"] Filter Grille this grille is a testament RFG3024 Black HP const content item Hi Lo Oval Stack Head this grille is a testament to high standard craftsmanship you can watch this informative video tutorial: How to Measure Your Vent Hole Before Ordering a Grille