12" X 12" Baseboard Return Air Grille - HVAC Vent Duct Cover - 7/8" Margin Turnback For Flush Fit With Baseboard Work - White 6" Diameter The first number in a

The first number in a grille size

and durability

+ Product Details Size – 14" x 18" or 18" x 14" is the size for the duct opening measurement only

75" Width X 9

+ Product Details Size – 24"w X 28"h is the size for the duct opening measurement only

12" X 12" Baseboard Return Air Grille - HVAC Vent Duct Cover - 7/8" Margin Turnback For Flush Fit With Baseboard Work - White 6" Diameter The first number in a+ Product Details Size 12"w X 12"h Is The Size For The Duct Opening Measurement Only, Actual Front End Outer Dimensions Are 13. 75" Width X 13. 75" Height SEE BELOW IN DESCRIPTION How To Measure A Grille Powder Coat Finish Smooth, shiny, scratch resistant, beautiful. Looks like it was just waxed. High Quality Easy unrestricted airflow for your HVAC system 7 8" margin turnback. Carefully Shrink Wrapped With cardboard backing to prevent damage in