Air Flow Products 77F141620 Transition Boot 14x16 20 in

Product Description

The AIR FLOW PRODUCTS 77F141620 is a straight transition boot with flange, designed to connect square or rectangular duct openings to round collars in forced-air HVAC distribution systems. The boot features a 14x16 inch square-to-round transition body and a 20-inch collar, making it suited for trunk-to-branch connections where duct geometry changes are required. Licensed HVAC installers and sheet metal contractors use this fitting when adapting rectangular trunk lines to round branch runs in residential and light commercial ductwork systems.

This transition boot is used in forced-air heating and cooling installations where a square or rectangular plenum or trunk line must transition to a round branch duct. The flanged design allows for secure attachment to a ceiling, wall, or floor register opening, providing a stable, sealed interface between the ductwork and the finished surface. It is appropriate for new construction and retrofit applications where maintaining proper airflow geometry is essential to system performance.

Key Features

• Square-to-round geometry transitions a 14x16 inch rectangular opening to a round collar
• 20-inch collar length provides extended reach for flexible or rigid round duct connections
• Integrated flange supports flush mounting to register openings or building surfaces
• Straight boot profile maintains consistent airflow direction without abrupt offsets
• Designed for standard forced-air HVAC trunk-to-branch duct configurations

Compatibility

Designed as an OEM-style replacement and new-installation fitting for residential and light commercial forced-air HVAC ductwork systems requiring a square-to-round straight transition with flange.

Installation Notes

Installation should be performed by a qualified HVAC technician or licensed sheet metal contractor in accordance with local mechanical codes and SMACNA duct construction standards. Shut down the air handling unit and verify the system is unpressurized before cutting into existing ductwork or seating the boot. Seal all joints with UL 181-rated mastic or approved metal foil tape to prevent air leakage. Secure the flange to the building surface using appropriate fasteners to ensure a rigid, airtight connection.

Technical Specifications

• Transition Type: Square to Round
• Opening Size: 14x16 inches
• Collar Length: 20 inches
• Boot Style: Straight with Flange

Standard Information

• Brand: AIR FLOW PRODUCTS
• Manufacturer Part Number: 77F141620