20" X 30" or 30" X 20" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 21.75 X 31.75] w28h28 Actual Filter Size – 33

Actual Filter Size – 33 3/4"w x 11 3/4" x 1"

Applications – Suitable for cutting plastic

these heavy-duty louvers are ideal for use in attics

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

+ Product Details Size – 12"w X 30"h or 30" x 12" is the size for the duct opening measurement only

20" X 30" or 30" X 20" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 21.75 X 31.75] w28h28 Actual Filter Size – 33+ 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