14" X 6" Baseboard Return Air Grille - HVAC Vent Duct Cover - 7/8" Margin Turnback For Flush Fit With Baseboard Work - White 2-Way + Product Details Size -

+ Product Details Size - 36"w X 28"h X 2"d (for duct opening measurement only)

By simply measuring the width or the length of the vent

+ Product Details Size – 18"w X 30"h is the size for the duct opening measurement only

For 8" Round Duct Opening - Spiral or Flex

14" X 6" Baseboard Return Air Grille - HVAC Vent Duct Cover - 7/8" Margin Turnback For Flush Fit With Baseboard Work - White 2-Way + Product Details Size -+ Product Details Size 14"w X 6"h Is The Size For The Duct Opening Measurement Only, Actual Front End Outer Dimensions Are 15. 75" Width X 7. 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 shipment