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] Aluminum Adjustable Curved Blade + Product Details Size –

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

This versatile guard features air circulating ports on all four sides to allow proper airflow

from 4" to 20"

Don’t worry

and home improvement remodeling specialists in completing their masterpieces

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] Aluminum Adjustable Curved Blade + Product Details Size –+ Product Details Size 18"w X 18"h is the size for the duct opening measurement only, actual front end outer dimensions are 19. 75" width X 19. 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.