Air Flow Products 77F111616 Transition Boot 11x16 16 in Collar

Product Description

The AIR FLOW PRODUCTS 77F111616 is a straight transition boot with flange designed to connect square or rectangular ductwork to round collar outlets in forced-air HVAC systems. The boot transitions an 11 by 16 inch rectangular opening to a 16-inch round collar, making it a critical fitting where trunk lines or plenums meet branch runouts. HVAC installers and sheet metal contractors use this fitting during new construction and retrofit duct work to maintain airflow geometry and minimize turbulence at the transition point. The integrated flange supports secure attachment to register boxes or ceiling and floor deck surfaces.

This fitting is suited for residential and light commercial forced-air installations where a square-to-round transition is required at the end of a rectangular duct run. It is commonly installed at floor, ceiling, or sidewall positions as a termination fitting before a grille or register. The 77F series designation identifies the straight-body, flanged style within the AIR FLOW PRODUCTS line, making it a standard selection for duct layout work on new builds and replacement jobs alike.

Key Features

• Straight-body design maintains consistent airflow path through the transition
• Integrated flange allows flush mounting to decking or register openings
• Square-to-round geometry bridges rectangular trunk or branch duct to round collar outlet
• 11 by 16 inch rectangular inlet with 16-inch round collar outlet
• 77F series construction suited for standard residential and light commercial duct systems

Compatibility

Designed as an OEM-style sheet metal transition fitting for standard forced-air residential and light commercial duct systems requiring a square-to-round boot with flange at the supply or return termination point.

Installation Notes

Installation is typically performed by a licensed HVAC technician or sheet metal contractor. Power down the air handler or furnace at the disconnect before beginning any duct work. Secure the flange to the decking surface using appropriate fasteners and seal all seams with listed duct sealant or metal-backed tape per local mechanical code requirements. Do not compress or restrict the collar opening during installation, as this will reduce airflow and system performance.

Technical Specifications

• Rectangular Inlet Size: 11 x 16 inches
• Round Collar Diameter: 16 inches
• Body Style: Straight Transition with Flange
• Transition Type: Square to Round
• Series: 77F

Standard Information

• Brand: AIR FLOW PRODUCTS
• Manufacturer Part Number: 77F111616