12" X 10" Baseboard Return Air Grille - HVAC Vent Duct Cover - 7/8" Margin Turnback For Flush Fit With Baseboard Work - White 14" Diameter Actual Filter Size – 29

Actual Filter Size – 29 3/4"w x 29 3/4" x 1"

actual front end outer dimensions are approximately 20 5/8" width X 18 5/8" height

+ Product Details Size – 20"w X 14"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 36" x 16" OR 16" x 36" duct opening (measured at the opening)

12" X 10" Baseboard Return Air Grille - HVAC Vent Duct Cover - 7/8" Margin Turnback For Flush Fit With Baseboard Work - White 14" Diameter Actual Filter Size – 29+ Product Details Size 12"w X 10"h Is The Size For The Duct Opening Measurement Only, Actual Front End Outer Dimensions Are 13. 75" Width X 11. 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