20"W X 20"H [Duct Opening] 4-Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 21.75"W X 21.75"H] w16h16 + Product Description Enhance your

+ Product Description Enhance your ventilation system with our high-quality grilles and registers

actual front end outer dimensions are approximately 16 5/8" width X 20 5/8" height

margin-right: 8px

Actual Filter Size – 29 3/4"w x 33 3/4" x 1"

+ Product Description Protect and secure your thermostat with this high-quality Clear Plastic Thermostat Guard

20"W X 20"H [Duct Opening] 4-Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 21.75"W X 21.75"H] w16h16 + Product Description Enhance your+ Product Details Size 20"w X 20"h is the size for the duct opening measurement only, actual front end outer dimensions are 21. 75" width X 21. 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.