20"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 13.75"h] Return Grille Think of the diameter as Height_14in WD G128 hp jblade overlay

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

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+ Product Details Operating Temperature From -40°F To +248°F [-40°C To +120°C]

+ Product Details Size - 26"w X 30"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are approximately 30 5/8" width X 38 5/8" height

20"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 21.75"w x 13.75"h] Return Grille Think of the diameter as Height_14in WD G128 hp jblade overlay Think of the diameter as a straight line from one end to the other * Adding space between bullet points * } li { margin bottom: 15px