Air Flow Products 77141618 Transition Boot 14x16 18in Collar

Product Description

The AIR FLOW PRODUCTS 77141618 is a straight transition boot with flange, designed to connect square or rectangular ductwork to round collar openings in forced-air HVAC distribution systems. This is a 77F-series fitting that transitions from a 14-inch by 16-inch square or rectangular opening to an 18-inch round collar. It is used to terminate duct runs at registers, grilles, or branch takeoffs where a geometry change is required. HVAC installers and sheet metal mechanics handle this fitting during new construction duct installation or duct modification work.

This transition boot is suited for residential and light commercial forced-air systems where a square-to-round conversion is needed at the end of a supply or return duct run. The integrated flange simplifies attachment to ceiling, floor, or wall register openings, keeping the fitting flush and secure. It is appropriate for use in standard low-pressure HVAC ductwork applications.

Key Features

• Square-to-round geometry: transitions a 14-inch by 16-inch rectangular opening to an 18-inch round collar
• Straight boot configuration for direct, in-line duct termination
• Integrated flange for secure attachment at register or grille openings
• 77F-series design for compatibility with standard duct fittings of this geometry
• Suitable for supply or return air duct termination in low-pressure forced-air systems

Compatibility

Designed as an OEM-style replacement or new-construction fitting for standard low-pressure forced-air HVAC duct systems requiring a square-to-round transition at a 14-inch by 16-inch opening with an 18-inch round collar.

Installation Notes

Installation is typically performed by a licensed HVAC technician or qualified sheet metal mechanic. Shut down the air handling system and verify the unit is de-energized before modifying any duct section. Secure the boot to the duct with sheet metal screws and seal all joints with UL 181-rated mastic or foil tape in accordance with local mechanical codes. The flange should be fastened flush to the finished surface before setting the register or grille.

Technical Specifications

• Configuration: Straight Transition Boot with Flange
• Series: 77F
• Inlet Size: 14 inches x 16 inches (square to round)
• Collar Diameter: 18 inches

Standard Information

• Brand: AIR FLOW PRODUCTS
• Manufacturer Part Number: 77141618