Air Flow Products 77F142014 Transition Boot Flange 14x20

Product Description

The AIR FLOW PRODUCTS 77F142014 is a straight transition boot with flange designed to connect square or rectangular ductwork to a round collar in residential and light commercial HVAC systems. This fitting transitions a 14 x 20 inch rectangular opening down to a round collar, allowing duct runs to terminate cleanly at registers, diffusers, or branch takeoffs. The flanged design seats flush against ceiling, floor, or wall surfaces and provides a secure surface for fastening. HVAC sheet metal installers and duct fabricators use this fitting during new construction and retrofit duct installations.

This transition boot is suited for low-pressure supply and return air duct systems in residential construction and light commercial applications. It is typically installed at the end of a rectangular duct run where a round collar connection is required for a diffuser or register boot. The flanged perimeter simplifies surface mounting and helps create an airtight fit against drywall, subfloor, or ceiling board without additional trim pieces.

Key Features

• Square-to-round geometry transitions rectangular duct to a round collar in a single fitting
• Integrated flange provides a flat seating surface for flush mounting against finished surfaces
• Straight profile maintains consistent airflow direction without offset or angled transitions
• 14 x 20 inch rectangular opening accommodates standard duct trunk dimensions
• Flanged collar end accepts round duct, flex duct, or boot extensions

Compatibility

Designed as an OEM-style sheet metal fitting for residential and light commercial forced-air duct systems requiring a square-to-round straight transition with a flanged face plate.

Installation Notes

Installation is typically performed by a licensed HVAC technician or sheet metal installer following local mechanical codes and SMACNA duct construction standards. Power down the air handling unit before cutting into existing ductwork or securing this fitting in place. Seal all joints with listed duct sealant or mastic and UL 181-rated tape to meet code requirements for air leakage. Secure the flange to the finished surface using appropriate fasteners for the substrate material.

Technical Specifications

• Configuration: Straight Square to Round Transition
• Rectangular Opening: 14 x 20 inches
• Style: With Flange
• Series: 77F

Standard Information

• Brand: AIR FLOW PRODUCTS
• Manufacturer Part Number: 77F142014