16"W X 10"H [Duct Opening] ALUMINUM RETURN GRILLE - EASY AIR FLOW - LINEAR BAR GRILLES [OUTER DIMENSIONS: 17.875"W X 11.875"H] Fixed Blades with Damper The door comes with a actual front end outer RFG1818 Black Welding & Soldering

The door comes with a convenient turn lock that can be effortlessly rotated using a flat rigid tool

+ Product Details Size - 6"w X 20"h X 2"d (for duct opening measurement only)

Actual Filter Size – 19 3/4"w x 23 3/4" x 1"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 26" x 12" OR 12" x 26" duct opening (measured at the opening)

+ Product Details Size – 10" x 26" or 26" x 10" is the size for the duct opening measurement only

16"W X 10"H [Duct Opening] ALUMINUM RETURN GRILLE EASY AIR FLOW LINEAR BAR GRILLES [OUTER DIMENSIONS: 17.875"W X 11.875"H] Fixed Blades with Damper The door comes with a actual front end outer RFG1818 Black Welding & Soldering The door comes with a convenient turn lock that can be effortlessly rotated using a flat rigid tool + Product Details Size 6"w X 20"h X 2"d (for duct opening measurement only)