Air Flow Products 7740805 Straight Register Boot 4x8 5in Collar

Product Description

The AIR FLOW PRODUCTS 7740805 is a straight register boot designed to connect round duct to a rectangular floor, wall, or ceiling register in residential and light commercial HVAC systems. The boot features a 4 inch by 8 inch register face opening and a 5 inch round collar for duct attachment. This fitting directs conditioned air from a branch duct into the occupied space through a standard register or grille. HVAC installers and sheet metal contractors use this type of boot during new construction and retrofit duct system work to terminate branch runs at supply registers.

This straight register boot is suited for residential forced-air supply duct systems where a branch run terminates at a floor, sidewall, or ceiling register. The 4 inch by 8 inch opening matches common standard register sizes, and the 5 inch collar accepts round flex duct or rigid round duct of the same diameter. It is installed where a straight inline connection between the duct run and the register face is appropriate for the layout.

Key Features

• Straight boot configuration for inline duct-to-register connections
• 4 inch by 8 inch rectangular register face opening fits standard register sizes
• 5 inch round collar for connection to round flex or rigid branch duct
• Suitable for floor, sidewall, or ceiling register terminations
• Compact form factor fits standard stud and joist bay framing

Compatibility

Designed as an OEM-style replacement or new-installation fitting compatible with standard 4 inch by 8 inch registers and 5 inch round branch duct in residential forced-air supply systems.

Installation Notes

Installation is typically performed by a licensed HVAC technician or sheet metal contractor. Shut down the air handling system before cutting into existing ductwork or fitting the boot into place. Secure the collar connection to the branch duct with sheet metal screws and foil-backed tape or mastic per local mechanical code requirements. Fasten the register face flange to the framing surface before attaching the register or grille.

Technical Specifications

• Register Face Opening: 4 inches x 8 inches
• Collar Diameter: 5 inches
• Boot Type: Straight

Standard Information

• Brand: AIR FLOW PRODUCTS
• Manufacturer Part Number: 7740805