18"x18" Stamped Face Steel Filter Return Grille Vent Cover White Poweder Coating with Frame Outside Dimension 20.6"x20.6" The Listed size 10'' X

The Listed size 10'' X 10'' is for inside duct opening measurement

• Efficient Air Distribution: Designed to deliver smooth

Width vs Height The first measurement in a return grille size is the width (horizontal measurement)

If you measure outside or surface size

18"x18" Stamped Face Steel Filter Return Grille Vent Cover White Poweder Coating with Frame Outside Dimension 20.6"x20.6" The Listed size 10'' XThe Listed size 18"x18" is for inside duct opening measurement, overall outside dimension is 20. 6"x20. 6" Stamped Face Steel Construction with 1 2" fin spacing for high air flow Screws are included for easy installation White Powder coating with matte finish Individually packed with cardboard box for ultra protection Size Selection Guide Measure the size of the air duct opening(the size of the hole ). Select the listed size that match the duct