10" X 10" [Duct Opening] 4-Way Air Vent Adjustable Aluminum Curved Blades Integral Multi-Shutter Damper HVAC Diffuser [Outer Dimensions: 11.75"W X 11.75"H] Compatible with Duct 10" these pipes offer easy handling

these pipes offer easy handling

+ Product Details Size - 26"w X 30"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 16 5/8" width X 14 5/8" height

+ Product Details Size – 18"w X 34"h is the size for the duct opening measurement only

The premium durable material guarantees that they will never rust or wear through

10" X 10" [Duct Opening] 4-Way Air Vent Adjustable Aluminum Curved Blades Integral Multi-Shutter Damper HVAC Diffuser [Outer Dimensions: 11.75"W X 11.75"H] Compatible with Duct 10" these pipes offer easy handling+ Product Details Size 10"w X 10"h is the size for the duct opening measurement only, actual front end outer dimensions are 11. 75" width X 11. 75" height. Design Individually adjusting curved blades. Multi shutter damper with handle operator to adjust air flow. 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