Air Flow Products 77162016 Transition Boot 16x20 16 Inch

Product Description

The AIR FLOW PRODUCTS 77162016 is a straight transition boot with flange, designed to connect square or rectangular ductwork to round collar openings in forced-air HVAC systems. Built to the 77F configuration, it transitions from a 16x20 inch rectangular opening to a 16 inch round collar. This fitting is installed by HVAC technicians during new construction or duct modification work where a square-to-round transition is required at a supply or return register location. The integrated flange simplifies attachment to ceiling, floor, or wall surfaces and helps secure the boot flush against the finished surface.

This transition boot is suited for residential and light commercial forced-air duct systems. It is used where a rectangular main trunk or branch duct must terminate at a round collar, typically feeding a round-neck register or grille. The 16x20 inlet and 16 inch collar sizing makes it appropriate for higher-volume supply or return runs in larger duct layouts. Installation occurs during the rough-in phase or during duct retrofit work.

Key Features

• 77F straight transition configuration with integrated mounting flange
• Square-to-round geometry: 16x20 inch rectangular inlet to 16 inch round collar
• Flange allows flush mounting to wall, ceiling, or floor surface
• Straight body design maintains consistent airflow direction without offset
• Sized for higher-volume duct branches in residential and light commercial systems

Compatibility

Designed as an OEM-style duct fitting for forced-air HVAC systems requiring a square-to-round transition at a 16x20 rectangular duct opening with a 16 inch round collar connection.

Installation Notes

Install this boot before finishing walls, ceilings, or floors, as it is typically set in place during the rough-in phase of ductwork. Power down the air handling unit and close the system before making duct connections. Use sheet metal screws and approved duct sealant or mastic at all joints to meet SMACNA standards and local mechanical code requirements. Do not overtighten fasteners at the flange, as distortion can affect the register or grille fit.

Technical Specifications

• Configuration: Straight Transition with Flange (77F)
• Inlet Size: 16x20 inches
• Collar Diameter: 16 inches
• Transition Type: Square to Round

Standard Information

• Brand: AIR FLOW PRODUCTS
• Manufacturer Part Number: 77162016