Air Flow Products RE053 Reducer Increaser 5 to 3 Inch

Product Description

The AIR FLOW PRODUCTS RE053 is a duct reducer-increaser fitting designed to transition airflow between a 5-inch and a 3-inch duct diameter. This type of fitting is a standard component in forced-air HVAC distribution systems, used wherever a main trunk or branch run requires a step-down or step-up in duct size to match differing collar or register openings. Licensed HVAC technicians and sheet metal installers work with reducer-increaser fittings during new duct installations, duct modifications, and system balancing projects where proper sizing is critical to maintaining design airflow.

This fitting is suited for residential and light commercial forced-air systems where duct diameter changes are required along supply or return air runs. It provides a smooth transition that helps maintain airflow velocity and reduces turbulence at the transition point. Installers will find this fitting appropriate for round duct systems requiring a 5-inch to 3-inch change in diameter.

Key Features

• Transitions between 5-inch and 3-inch round duct diameters
• Reducer-increaser design supports both step-down and step-up duct configurations
• Intended for use in forced-air HVAC supply and return duct systems
• Standard round duct fitting format for compatibility with common duct collars and takeoffs

Compatibility

Designed as an OEM-style replacement or new-installation fitting for round duct systems requiring a 5-inch to 3-inch diameter transition in residential or light commercial HVAC applications.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified sheet metal installer following applicable mechanical codes. Power down the air handling unit and confirm airflow has stopped before working on duct connections. Secure the fitting with sheet metal screws and seal all joints with UL 181-listed duct tape or mastic sealant to prevent air leakage. Verify that the installed duct sizing aligns with the system's original design airflow requirements before restoring operation.

Technical Specifications

• Fitting Type: Reducer-Increaser
• Large End Diameter: 5 inches
• Small End Diameter: 3 inches
• Duct Shape: Round

Standard Information

• Brand: AIR FLOW PRODUCTS
• Manufacturer Part Number: RE053