Air Flow Products 77121614 Transition Boot 12x16 to 14in

Product Description

The AIR FLOW PRODUCTS 77121614 is a straight transition boot with flange, designed to convert a rectangular duct opening to a round collar in HVAC sheet metal ductwork systems. This fitting transitions from a 12-inch by 16-inch square or rectangular duct face to a 14-inch round collar, with a 16-inch collar length. It is a fixed-geometry, straight-profile boot, making it suitable for low-clearance or in-line installations where angled transitions are not required. HVAC sheet metal mechanics and duct installers specify this type of fitting when a system requires a clean square-to-round conversion without offset.

This transition boot is used in residential and light commercial forced-air duct systems where rectangular trunk lines must connect to round branch runs or equipment collars. The flanged face seats against a plenum wall, air handler casing, or duct panel, providing a secure mechanical connection point. It is appropriate for new construction and retrofit applications where the duct layout calls for a straight, in-line square-to-round fitting at the 12x16 opening size.

Key Features

• Straight-profile design for in-line square-to-round duct transitions
• Flanged face for positive seating against plenum walls or equipment casings
• 12-inch by 16-inch rectangular face transitions to a 14-inch round collar
• 16-inch collar length accommodates standard round duct connections
• Fixed geometry eliminates field fabrication of custom transition pieces

Compatibility

Designed as an OEM-style sheet metal fitting for residential and light commercial forced-air duct systems requiring a straight square-to-round transition at a 12x16 rectangular opening with a 14-inch round collar.

Installation Notes

Installation is typically performed by licensed HVAC technicians or sheet metal mechanics. Shut down the air handling system and de-energize the unit before beginning duct modifications. Secure the flanged face to the plenum or duct panel using sheet metal screws, and seal all seams with listed duct sealant or UL 181-rated tape in accordance with local mechanical codes. Verify that round collar connections are properly supported to prevent stress on the fitting body.

Technical Specifications

• Fitting Style: Straight Transition Boot with Flange
• Duct Face Size: 12 inches x 16 inches (rectangular)
• Collar Diameter: 14 inches (round)
• Collar Length: 16 inches
• Transition Type: Square to Round

Standard Information

• Brand: AIR FLOW PRODUCTS
• Manufacturer Part Number: 77121614