30"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 31.75"w x 21.75"h] Compatible With Duct 6in + Product Details Size - VF-WB 2x12 PB our damper helps create 6" Round Duct Pipe

+ Product Details Size - 24"w X 24"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are approximately 31 5/8" width X 24 5/8" height -

+ Product Details Size – 30"w X 6"h is the size for the duct opening measurement only

listed size +1

this guard fits almost any thermostat and blends seamlessly into any setting

30"w X 20"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 31.75"w x 21.75"h] Compatible With Duct 6in + Product Details Size VF WB 2x12 PB our damper helps create 6" Round Duct Pipe + Product Details Size 24"w X 24"h X 2"d (for duct opening measurement only) actual front end outer dimensions are approximately 31 5 8" width X 24 5 8" height