12"W X 10"H [Duct Opening] Aluminum Double Deflection Adjustable Air Supply HVAC Diffuser - [Outer Dimensions: 13.6"W X 11.6"H] 2-Way Actual Filter Size – 21

Actual Filter Size – 21 3/4"w x 5 3/4" x 1"

actual front end outer dimensions are approximately 24 5/8" width X 8 5/8" height

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12"W X 10"H [Duct Opening] Aluminum Double Deflection Adjustable Air Supply HVAC Diffuser - [Outer Dimensions: 13.6"W X 11.6"H] 2-Way Actual Filter Size – 21+ 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,