Stick-on Collar Duct with Damper | Galvanized Steel Metal Collar Duct with Damper 30 Gauge | 7" Stick on Collar w/Damper is Compatible with Duct 7" 16" Round Duct Pipe 875" width X 6" height Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

875" width X 6" height

+ Product Details Size – 20"w X 36"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 30 5/8" width X 34 5/8" height

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+ Product Details Size - 36"w X 22"h is the size for the duct opening measurement only

Stick on Collar Duct with Damper Galvanized Steel Metal Collar Duct with Damper 30 Gauge 7" Stick on Collar w Damper is Compatible with Duct 7" 16" Round Duct Pipe 875" width X 6" height Compatible With Duct 7in Applications This sheet metal DDAG A 1212 875" width X 6" height + Product Details Size – 20"w X 36"h is the size for the duct opening measurement only