12"W X 10"H [Duct Opening] Aluminum Double Deflection Adjustable Air Supply HVAC Diffuser - [Outer Dimensions: 13.6"W X 11.6"H] fixed bar while the ingenious dial-controlled damper

while the ingenious dial-controlled damper empowers you to effortlessly regulate airflow using your foot

Actual Filter Size – 9 3/4"w x 17 3/4" x 1"

+ Product Details Size - 28"w X 20"h is the size for the duct opening measurement only

listed size +2"

Actual Filter Size – 33 3/4"w x 9 3/4" x 1"

12"W X 10"H [Duct Opening] Aluminum Double Deflection Adjustable Air Supply HVAC Diffuser - [Outer Dimensions: 13.6"W X 11.6"H] fixed bar while the ingenious dial-controlled damper+ Product Details Size 12"w X 10"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 6" width X 11. 6" height. Design Full Control Vertical Horizontal Air flow Direction. Horizontal blades in the front, Vertical blades in the back, both individually adjustable. High Quality Aluminum The premium durable aluminum will never rust and it will never wear through leaving the material with an elegant,