16" X 16" Steel Return Air Filter Grille for 1" Filter - Fixed Hinged - [Outer Dimensions: 18 5/8" X 18 5/8"] ceiling /* Adding space between bullet 4 X 12 Is CRFG2028 Width_14in

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actual front end outer dimensions are approximately 10 5/8" width X 14 5/8" height

+ Product Details Size - 10"w X 18"h is the size for the duct opening measurement only

+ Product Details Size - 18"w X 6"h is the size for the duct opening measurement only

+ Product Details Size – 15" Corner Baseboard Grille - White - HVAC corner vent cover

16" X 16" Steel Return Air Filter Grille for 1" Filter Fixed Hinged [Outer Dimensions: 18 5 8" X 18 5 8"] ceiling * Adding space between bullet 4 X 12 Is CRFG2028 Width_14in * Adding space between bullet points * } li { margin bottom: 15px actual front end outer dimensions are approximately 10 5 8" width X 14 5 8" height