20"W X 6"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 21.875"W X 7.875"H] 18" Round Duct Pipe the second number represents the

the second number represents the width

+ Product Details Size - 6"w X 6"h Is The Size For The Duct Opening Only

High Standard Quality - Every part is hand inspected for quality before it is packaged

+ Product Details Size – 30"w X 16"h is the size for the duct opening measurement only

+ How To Measure A Round Vent Overall Size:

20"W X 6"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 21.875"W X 7.875"H] 18" Round Duct Pipe the second number represents the+ Product Details Size 20"w X 6"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 21. 875" width X 7. 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