6" X 20" Or 20" X 6" Heavy Duty Floor Grille - Fixed Blades Air Grille - Brown [Outer Dimensions: 7.75 X 21.75] Extruded Aluminum Ceiling + Product Details Size – Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Size – 28" x 36" or 36" x 28" is the size for the duct opening measurement only

Actual Filter Size – 31 3/4"w x 13 3/4" x 1"

+ Product Details Size - 17"w X 10"h is the size for the duct opening measurement only

actual front end outer dimensions are 13" width X 25" height

Complies with industry standards of USA: ASTM D-882

6" X 20" Or 20" X 6" Heavy Duty Floor Grille Fixed Blades Air Grille Brown [Outer Dimensions: 7.75 X 21.75] Extruded Aluminum Ceiling + Product Details Size – Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size – 28" x 36" or 36" x 28" is the size for the duct opening measurement only Actual Filter Size – 31 3 4"w x 13 3 4" x 1"