16"W X 16"H [Duct Opening] 4-Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 17.75"W X 17.75"H] Aluminum Adjustable Curved Blade Built-In Locking System – Comes

Built-In Locking System – Comes with a permanently attached eight-tumbler lock and a supplied key for added security

+ Product Details Size – 12"w X 34"h is the size for the duct opening measurement only

+ Product Details Size – 28"w X 28"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 30 5/8" width X 22 5/8" height

+ Product Details Size – 26"w X 12"h is the size for the duct opening measurement only

16"W X 16"H [Duct Opening] 4-Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 17.75"W X 17.75"H] Aluminum Adjustable Curved Blade Built-In Locking System – Comes+ Product Details Size 16"w X 16"h is the size for the duct opening measurement only, actual front end outer dimensions are 17. 75" width X 17. 75" height. Design Individually adjusting curved blades for better air flow control. Screws Included High Quality Aluminum The premium durable aluminum will never rust and it will never wear through leaving the material with an elegant, beautiful, and smooth surface, adds a luxurious touch to any home.