Mm Manufacturing 202RF-8X4X5 Flanged Register Boot 8x4x5

Product Description

The MM Manufacturing 202RF-8X4X5 is a center-end flanged register boot designed to connect rectangular duct openings to round duct runs in residential and light commercial HVAC systems. The boot measures 8 inches by 4 inches at the register face and transitions to a 5-inch round collar, making it a standard choice for branch takeoffs in forced-air supply systems. Constructed for a secure, low-leak fit, the flanged perimeter seats flush against finished flooring, ceilings, or wall surfaces. HVAC installers and sheet metal contractors use this boot when terminating supply runs at floor, ceiling, or sidewall register locations.

This boot fits supply air distribution systems where a 5-inch round duct feeds an 8-inch by 4-inch register opening. The 202RF series is produced in multiple sizes to serve a range of round duct diameters, including 5-inch, 6-inch, 7-inch, 8-inch, and 9-inch round duct connections. It is suited for new construction and retrofit applications in ducted forced-air heating and cooling systems where a flanged boot is required for a clean register mounting surface.

Key Features

• Center-end configuration routes round duct into the end of the boot, with the register face centered on the opposite side
• Integral flange provides a flat mounting surface for standard floor, ceiling, or wall registers
• 8-inch by 4-inch register face opening accepts standard sized grilles and registers
• 5-inch round collar connects directly to 5-inch round supply duct
• Lightweight at 1 pound for easy single-technician handling during installation
• Available across 8 popular sizes to support multiple round duct diameters in the same product family

Compatibility

Designed as an OEM-style replacement and new-construction component for ducted forced-air HVAC systems requiring a center-end flanged register boot with a 5-inch round collar and an 8-inch by 4-inch register face opening.

Installation Notes

Installation is typically performed by a licensed HVAC technician or sheet metal contractor. Power down the air handling unit at the disconnect before working in the duct system. Secure the round collar to the supply duct branch using sheet metal screws and seal all joints with UL 181-rated mastic or foil tape per local mechanical code requirements. Fasten the register face flange to the framing or finish surface before setting the grille or register.

Technical Specifications

• Register Face Size: 8 x 4 inches
• Round Collar Diameter: 5 inches
• Length: 14 inches
• Width: 6.5 inches
• Height: 8 inches
• Weight: 1 pound

Standard Information

• Brand: MM Manufacturing
• Manufacturer Part Number: 202RF-8X4X5