8" X 4" [Duct Opening] 2-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 9.75"H X 5.75"H] w18h18 + Product Details Size - Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Size - 25"w X 26"h is the size for the duct opening measurement only

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

our Butterfly Damper simplifies the process of managing airflow

+ Product Details Size – 12"w X 28"h is the size for the duct opening measurement only

Actual Filter Size – 15 3/4"w x 31 3/4" x 1"

8" X 4" [Duct Opening] 2 Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 9.75"H X 5.75"H] w18h18 + Product Details Size Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size 25"w X 26"h is the size for the duct opening measurement only Actual Filter Size – 9 3 4"w x 9 3 4" x 1"