30" X 6" Baseboard Return Air Grille - HVAC Vent Duct Cover - 7/8" Margin Turnback For Flush Fit With Baseboard Work - White w36h36 Actual Filter Size – 33

Actual Filter Size – 33 3/4"w x 19 3/4" x 1"

+ Product Details Size - 10"w X 20"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 30 5/8" width X 28 5/8" height

+ Product Details Size - 18"w X 16"h X 2"d (for duct opening measurement only)

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30" X 6" Baseboard Return Air Grille - HVAC Vent Duct Cover - 7/8" Margin Turnback For Flush Fit With Baseboard Work - White w36h36 Actual Filter Size – 33+ Product Details Size 30"w X 6"h Is The Size For The Duct Opening Measurement Only, Actual Front End Outer Dimensions Are 31. 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