Round Stack Boot 12" X 3.25" X 7" round Compatible with 7" Duct Galvanized Steel while the included safety wire

while the included safety wire provides added security to prevent the door from falling off

+ Product Details Size - 14"w X 25"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 26 5/8" width X 24 5/8" height

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

Round Stack Boot 12" X 3.25" X 7" round Compatible with 7" Duct Galvanized Steel while the included safety wire+ Product Details Size The size of a galvanized sheet metal stack boot is 12" X 3. 25" X 7". It is compatible with duct 7". Design The stack boot at the bottom of the stack allows a transition from an ordinary large round or rectangular duct to a thin wall mounted duct. Applications The straight boot is used for a straight line transition going from round pipe or insulated flex duct to wall stack. Premium Quality Our straight round stack boot is made