12"W X 8"H [Duct Opening] Aluminum Double Deflection Adjustable Air Supply HVAC Diffuser - [Outer Dimensions: 13.6"W X 9.6"H] ceiling Example: If your hole is

Example: If your hole is 20" wide by 14" tall

+ Product Details Size - 28"w X 4"h is the size for the duct opening measurement only

+ Product Details Size – 32"w X 26"h is the size for the duct opening measurement only

These are airflow control components made to connect to supply grilles of the drop ceiling

+ Product Details Size - 25"w X 32"h is the size for the duct opening measurement only

12"W X 8"H [Duct Opening] Aluminum Double Deflection Adjustable Air Supply HVAC Diffuser - [Outer Dimensions: 13.6"W X 9.6"H] ceiling Example: If your hole is+ Product Details Size 12"w X 8"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 6" width X 9. 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,