12" X 30" or 30" X 12" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 13.75 X 31.75] 14in diameter For 8" Round Duct Opening

For 8" Round Duct Opening - Spiral or Flex

Actual Filter Size – 15 3/4"w x 19 3/4" x 1"

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+ Product Details Size & Compatibilty - The 4" to 3" round metal pipe reducer & increaser 30 gauge is compatible with duct 4" to 3"

12" X 30" or 30" X 12" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 13.75 X 31.75] 14in diameter For 8" Round Duct Opening+ Product Details Size 12"w X 30"h or 30" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" width X 31. 75" height. High Quality High grade steel construction meant for high foot traffic areas. Installation Location Floor. Design Easy drop in installation Powder Coat Finish Smooth, shiny, scratch resistant, with no sharp edges. Looks like it was just waxed. Quality Packaging Carefully