8"W X 8"H [Duct Opening] 4-Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 9.75"W X 9.75"H] w28h28 Actual Filter Size – 21

Actual Filter Size – 21 3/4"w x 11 3/4" x 1"

Horizontal blades in the front

+ Product Details Size - 28"w X 16"h is the size for the duct opening measurement only

It features an eight-tumbler lock with a supplied key for secure access

8"W X 8"H [Duct Opening] 4-Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 9.75"W X 9.75"H] w28h28 Actual Filter Size – 21+ Product Details Size 8"w X 8"h is the size for the duct opening measurement only, actual front end outer dimensions are 9. 75" width X 9. 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. Carefully