24"W X 10"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 25.875"W X 11.875"H] Color_R-8.0 Pink And is classified as Class 4 X 12 Is CRFG2028 Width_14in

And is classified as Class 1 Fire Proof - B1

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 12" or 12" x 10" duct opening (measured at the opening)

actual front end outer dimensions are approximately 14 5/8" width X 12 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 32" OR 32" x 30" duct opening (measured at the opening)

actual front end outer dimensions are approximately 34 5/8" width X 16 5/8" height

24"W X 10"H [Duct Opening] ALUMINUM RETURN GRILLE Easy Air Flow Linear Bar Grilles [Outer Dimensions: 25.875"W X 11.875"H] Color_R 8.0 Pink And is classified as Class 4 X 12 Is CRFG2028 Width_14in And is classified as Class 1 Fire Proof B1 + Product Details Perfect Fit & Easy Sizing Designed for a 10" x 12" or 12" x 10" duct opening (measured at the opening)