Air Flow Products 77162018 Transition Boot 16x20 18 Inch

Product Description

The AIR FLOW PRODUCTS 77162018 is a straight transition boot with flange, designed to connect square or rectangular ductwork to round collar outlets in forced-air HVAC systems. Built to the 77F profile, it transitions from a 16x20 inch rectangular opening to an 18-inch round collar. This fitting is a standard component in residential and light commercial duct installations where a square-to-round conversion is required at the air handler, trunk line, or plenum takeoff. HVAC sheet metal mechanics and duct installers typically work with this fitting during new construction or duct retrofit projects.

This transition boot is suited for forced-air heating and cooling applications where rectangular ductwork must terminate into a round collar connection. The integrated flange provides a secure mounting surface for attachment to air handling equipment, plenums, or trunk ducts. It is commonly installed at the supply or return side of residential and light commercial air distribution systems requiring a 16x20 to 18-inch square-to-round conversion.

Key Features

• Square-to-round transition from a 16x20 inch rectangular opening to an 18-inch round collar
• Straight boot configuration for in-line duct connections without offset
• Integrated flange for secure attachment to plenums, trunks, or air handling equipment
• 77F profile designation for standardized fitment in commercial and residential duct systems
• 18-inch collar accommodates large-diameter round duct runs typical in light commercial layouts

Compatibility

Designed as an OEM-style sheet metal fitting for forced-air HVAC duct systems requiring a square-to-round transition at 16x20 inch rectangular openings with an 18-inch round collar outlet.

Installation Notes

Installation should be performed by a qualified HVAC technician or sheet metal mechanic in accordance with SMACNA ductwork standards and applicable local mechanical codes. Power down the air handling system before installing or modifying any duct components. Seal all joints with approved mastic or foil-backed tape to maintain system efficiency and prevent air leakage. Secure the flange to the mating surface using appropriate fasteners to ensure a rigid, airtight connection.

Technical Specifications

• Product Type: Straight Transition Boot with Flange
• Profile: 77F Square to Round
• Rectangular Opening: 16x20 inches
• Collar Diameter: 18 inches

Standard Information

• Brand: AIR FLOW PRODUCTS
• Manufacturer Part Number: 77162018