Air Flow Products 77161616 Transition Boot 16x16 16 Inch

Product Description

The AIR FLOW PRODUCTS 77161616 is a straight transition boot with flange, designed to connect square or rectangular duct openings to round collar duct runs. The boot features a 16x16 inch square inlet and a 16 inch round collar outlet, making it a core fitting for transitioning between flat duct sections and round trunk or branch lines. This type of fitting is standard in low-pressure residential and light commercial HVAC supply and return systems. Sheet metal workers and HVAC installers use this fitting when converting duct geometry at air handlers, plenums, and distribution points.

The 77161616 is suited for residential and light commercial forced-air systems where square or rectangular duct must transition to a round collar for flexible or rigid round ductwork connections. The 77F series flange design allows the boot to seat flat against a plenum wall, ceiling, or sub-floor deck, providing a secure, airtight mounting surface. This fitting is commonly installed at air handler outlets, supply plenum taps, and return air boxes where a round collar collar connection is required.

Key Features

• Square to round geometry: 16x16 inch inlet transitions to a 16 inch round collar
• Integrated flange for flat mounting against plenum walls, decks, or framing
• Straight boot profile maintains consistent airflow direction through the transition
• 77F series design for standard low-pressure forced-air duct systems
• Compatible with both flexible and rigid round duct connections at the collar

Compatibility

Designed as an OEM-style replacement and standard fitting for residential and light commercial forced-air HVAC duct systems requiring a square to round transition at supply or return air plenums.

Installation Notes

This fitting is typically installed by licensed sheet metal workers or HVAC technicians. Power down the air handling unit and verify the system is de-energized before beginning any ductwork modification. The flange should be secured to the plenum or framing surface using appropriate sheet metal screws, and all seams and the collar connection should be sealed with UL 181-rated mastic or foil tape in accordance with local mechanical codes and SMACNA guidelines. Do not overtighten fasteners at the collar connection when attaching flexible duct.

Technical Specifications

• Inlet Size: 16x16 inches
• Collar Diameter: 16 inches
• Boot Style: Straight
• Transition Type: Square to Round
• Flange: Yes
• Series: 77F

Standard Information

• Brand: AIR FLOW PRODUCTS
• Manufacturer Part Number: 77161616