12"W X 10"H [Duct Opening] Aluminum Double Deflection Adjustable Air Supply HVAC Diffuser - [Outer Dimensions: 13.6"W X 11.6"H] Width_20in + Product Details Size - Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Size - 28"w X 16"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 34 5/8" width X 24 5/8" height

+ Product Details Size – 26"w X 34"h is the size for the duct opening measurement only

Actual Filter Size – 27 3/4"w x 5 3/4" x 1"

+ Product Details Size - 26"w X 22"h is the size for the duct opening measurement only

12"W X 10"H [Duct Opening] Aluminum Double Deflection Adjustable Air Supply HVAC Diffuser [Outer Dimensions: 13.6"W X 11.6"H] Width_20in + Product Details Size Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size 28"w X 16"h is the size for the duct opening measurement only actual front end outer dimensions are approximately 34 5 8" width X 24 5 8" height