Broan-nutone s413 Round Duct Transition 3.25x10 to 8 Inches

Product Description

The BROAN-NUTONE s413 is a duct transition fitting designed to connect a 3.25 x 10 inch rectangular duct opening to an 8-inch round duct. This type of fitting is a standard component in residential and light-commercial ventilation systems where ductwork changes from a flat rectangular profile to a round run. HVAC technicians and ventilation installers use transitions like this when routing exhaust or supply air from range hoods, bath fans, or air handlers into round duct runs. The s413 provides the geometry change needed to maintain airflow continuity between differing duct shapes and sizes.

This transition is typically used in kitchen range hood installations, bathroom ventilation setups, and similar exhaust applications where a rectangular collar on the unit must connect to a round duct in the wall or ceiling. It is suited for residential new construction and retrofit work where the existing duct run is 8-inch round and the appliance collar is 3.25 x 10 inches.

Key Features

• Transitions from a 3.25 x 10 inch rectangular opening to an 8-inch round duct
• Designed for use with BROAN-NUTONE ventilation equipment using matching collar dimensions
• Standard fitting geometry supports common residential exhaust duct layouts
• Compact form factor suitable for tight installation spaces above cabinets or in ceiling cavities

Compatibility

Designed as an OEM-style duct transition for BROAN-NUTONE ventilation appliances with a 3.25 x 10 inch rectangular duct collar connecting to an 8-inch round duct system.

Installation Notes

This fitting is installed by HVAC technicians or ventilation specialists as part of an exhaust duct system. Shut off power to the connected appliance before beginning duct work. Secure all duct connections with approved foil tape or sheet metal screws and seal joints to prevent air leakage, in accordance with applicable mechanical codes. Do not restrict or compress the duct transition during installation, as this reduces airflow performance.

Technical Specifications

• Product Type: Round Duct Transition
• Rectangular Duct Opening: 3.25 x 10 inches
• Round Duct Size: 8 inches

Standard Information

• Brand: BROAN-NUTONE
• Manufacturer Part Number: s413