30" X 8" Baseboard Return Air Grille - HVAC Vent Duct Cover - 7/8" Margin Turnback For Flush Fit With Baseboard Work - White Adjustable Return this 4-way air vent diffuser

this 4-way air vent diffuser allows you to precisely control airflow

built for durability and long life in mind

fasten the edges to studs with the provided screws

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 10" OR 10" x 20" duct opening (measured at the opening)

+ Product Details Size - 34"w X 22"h is the size for the duct opening measurement only

30" X 8" Baseboard Return Air Grille - HVAC Vent Duct Cover - 7/8" Margin Turnback For Flush Fit With Baseboard Work - White Adjustable Return this 4-way air vent diffuser+ Product Details Size 30"w X 8"h Is The Size For The Duct Opening Measurement Only, Actual Front End Outer Dimensions Are 31. 75" Width X 9. 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