Air Flow Products RE065 Reducer Increaser 6 to 5 Inch

Product Description

The AIR FLOW PRODUCTS RE065 is a duct reducer-increaser fitting designed to transition between 6-inch and 5-inch round ductwork sections. This type of fitting is used to step duct diameter up or down within a supply or return air system, maintaining airflow continuity where duct sizes change. Licensed sheet metal mechanics and HVAC installers work with fittings like this during new construction trunk-and-branch layouts and retrofit modifications. The RE065 is a compact, purpose-built transition piece that seats into standard round duct connections at both ends.

The RE065 is suited for residential and light commercial HVAC duct systems where a 6-inch-to-5-inch diameter transition is required. Common install scenarios include branch takeoff adjustments, equipment replacement where duct sizing does not match the new unit's collar, and system rebalancing work. This fitting allows the installer to reduce or increase duct diameter within a single piece rather than using multiple fittings, keeping transitions clean and minimizing pressure drop.

Key Features

• Transitions between 6-inch and 5-inch round duct diameters in a single fitting
• Suitable for both reducing and increasing duct diameter depending on airflow direction
• Designed for integration into standard round duct supply and return systems
• Compact form factor reduces the need for additional transition fittings

Compatibility

Designed as an OEM-style replacement and new-install fitting for residential and light commercial round duct systems requiring a 6-inch to 5-inch transition.

Installation Notes

Installation is typically performed by licensed HVAC technicians or sheet metal mechanics. Power down the air handling unit and confirm the system is de-energized before modifying any ductwork. Secure the fitting with sheet metal screws and seal all joints with UL 181-listed duct tape or mastic sealant in accordance with local mechanical codes. Do not force the fitting onto undersized duct collars.

Technical Specifications

• Large End Diameter: 6 inches
• Small End Diameter: 5 inches
• Fitting Type: Reducer-Increaser

Standard Information

• Brand: AIR FLOW PRODUCTS
• Manufacturer Part Number: RE065