Air Flow Products RE064 Reducer Increaser 6 to 4 Inch

Product Description

The AIR FLOW PRODUCTS RE064 is a round duct reducer-increaser fitting designed to transition between 6-inch and 4-inch duct diameters in forced-air ventilation and HVAC distribution systems. This type of fitting is used to step duct sizing up or down at branch connections, plenums, or where airflow must be redirected through a smaller or larger duct run. HVAC installers and sheet metal contractors use reducer-increaser fittings as standard components during duct system fabrication and retrofit work. The RE064 is a straightforward, functional fitting suited for both new construction and replacement applications.

This fitting is appropriate for residential and light commercial forced-air systems where a 6-inch to 4-inch duct transition is required. Common install scenarios include supply trunk-to-branch transitions, register boot approach runs, and duct modification work during system balancing or renovation. The 85-degree designation in the product reference indicates the fitting geometry relevant to this transition configuration.

Key Features

• Transitions between 6-inch and 4-inch round duct diameters
• Suitable for supply and return air duct applications in forced-air systems
• Standard reducer-increaser geometry for smooth airflow transition
• Compatible with standard round duct and fittings at both connection ends

Compatibility

Designed as an OEM-style duct fitting for use with standard 6-inch and 4-inch round duct systems in residential and light commercial forced-air HVAC installations.

Installation Notes

Installation is typically performed by a licensed HVAC technician or sheet metal contractor. The system blower should be shut off and the unit powered down before modifying any duct connections. Joints should be sealed with UL 181-listed mastic or metal tape in accordance with local mechanical codes. Sheet metal screws are commonly used to secure the fitting to adjacent duct sections prior to sealing.