16" X 16" [Duct Opening] 4-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 17.75"W X 17.75"H] Compatible With Duct 8in Actual Filter Size – 31 Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

Actual Filter Size – 31 3/4"w x 23 3/4" x 1"

line-height: 1

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+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 25" OR 25" X 16" duct opening (measured at the opening)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 20" OR 20" X 16" duct opening (measured at the opening)

16" X 16" [Duct Opening] 4 Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 17.75"W X 17.75"H] Compatible With Duct 8in Actual Filter Size – 31 Compatible With Duct 7in Applications This sheet metal DDAG A 1212 Actual Filter Size – 31 3 4"w x 23 3 4" x 1" line height: 1