18"W X 18"H [Duct Opening] 4-Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 19.75"W X 19.75"H] Grilles Adjustable airflow control - by Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

Adjustable airflow control - by rotating the middle disk

+ Product Details Size – 34"w X 36"h is the size for the duct opening measurement only

+ Product Details Size - 10"w X 8"h is the size for the duct opening measurement only

order a 20x14 grille

width: 100%

18"W X 18"H [Duct Opening] 4 Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 19.75"W X 19.75"H] Grilles Adjustable airflow control by Compatible With Duct 7in Applications This sheet metal DDAG A 1212 Adjustable airflow control by rotating the middle disk + Product Details Size – 34"w X 36"h is the size for the duct opening measurement only