12"W X 6"H [Duct Opening] ALUMINUM RETURN GRILLE - EASY AIR FLOW - LINEAR BAR GRILLES [OUTER DIMENSIONS: 13.875"W X 7.875"H] Insulated Line Set actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in

actual front end outer dimensions are approximately 27 5/8" width X 27 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 36" x 20" OR 20" x 36" duct opening (measured at the opening)

Design – Rigid gauge built for durability and long life in mind

This access door offers enhanced safety and security

actual front end outer dimensions are approximately 22 5/8" width X 26 5/8" height

12"W X 6"H [Duct Opening] ALUMINUM RETURN GRILLE EASY AIR FLOW LINEAR BAR GRILLES [OUTER DIMENSIONS: 13.875"W X 7.875"H] Insulated Line Set actual front end outer dimensions 4 X 12 Is CRFG2028 Width_14in actual front end outer dimensions are approximately 27 5 8" width X 27 5 8" height + Product Details Perfect Fit & Easy Sizing Designed for a 36" x 20" OR 20" x 36" duct opening (measured at the opening)