18"W X 8"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 19.875"W X 9.875"H] w6h6 Think of the diameter as

Think of the diameter as a straight line from one end to the other

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Actual Filter Size – 27 3/4"w x 17 3/4" x 1"

+ Product Details Size – 14"w X 22"h is the size for the duct opening measurement only

+ Product Details Size – 25"w X 6"h is the size for the duct opening measurement only

18"W X 8"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 19.875"W X 9.875"H] w6h6 Think of the diameter as+ Product Details Size 18"w X 8"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 875" width X 9. 875" height. High Quality High quality aluminum with counter sunk screw holes (screws included) and no sharp edges. Design Unrestricted airflow For Your HVAC system noise free components no vibrating louvers etc. Powder Coat Finish Smooth, shiny, scratch resistant, beautiful. Looks like it was