14"W X 12"H [Duct Opening] 3-Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 15.75"W X 13.75"H] Aluminum - Cube Core actual front end outer dimensions 14" Round Duct Pipe For 10 duct opening FR M 414 White

actual front end outer dimensions are approximately 10 5/8" width X 8 5/8" height

these heavy-duty louvers are ideal for use in attics

Adjustable airflow control - by rotating the middle disk

actual front end outer dimensions are approximately 38 5/8" width X 18 5/8" height -

14"W X 12"H [Duct Opening] 3 Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 15.75"W X 13.75"H] Aluminum Cube Core actual front end outer dimensions 14" Round Duct Pipe For 10 duct opening FR M 414 White actual front end outer dimensions are approximately 10 5 8" width X 8 5 8" height these heavy duty louvers are ideal for use in attics