Air Flow Products RE108 Reducer Increaser 10 to 8 in

Product Description

The AIR FLOW PRODUCTS RE108 is a round duct reducer-increaser fitting designed to transition between 10-inch and 8-inch duct diameters in forced-air HVAC systems. This type of fitting is used to step duct size up or down along a supply or return air run, maintaining airflow continuity through the system. It carries a series designation of 85, indicating its fitting profile within the AIR FLOW PRODUCTS lineup. HVAC installers and sheet metal mechanics use fittings like the RE108 when connecting trunks, branches, or equipment collars that differ in diameter.

The RE108 is suited for residential and light commercial ductwork installations where a 10-inch to 8-inch round duct transition is required. Typical applications include connecting a larger trunk line to a smaller branch run, reducing down from a plenum outlet, or stepping up from equipment connections to larger duct runs. The fitting works within standard round duct systems using conventional slip or drive connections common to sheet metal ductwork.

Key Features

• Transitions between 10-inch and 8-inch round duct diameters
• Series 85 fitting profile for standard duct system integration
• Functions as both a reducer and increaser depending on airflow direction
• Compatible with conventional round duct slip and drive connection methods

Compatibility

Designed as an OEM-style replacement and standard fitting for residential and light commercial round duct systems requiring a 10-inch to 8-inch diameter transition.

Installation Notes

Installation of duct fittings should be performed by a licensed HVAC technician or qualified sheet metal mechanic in accordance with applicable mechanical codes, including SMACNA ductwork standards. Power down the air handling unit or furnace at the disconnect before opening the duct system. Seal all joints with listed duct sealant or metal-backed tape per local code requirements. Do not use standard cloth duct tape as a primary air seal.

Technical Specifications

• Large End Diameter: 10 inches
• Small End Diameter: 8 inches
• Series: 85
• Fitting Type: Round Duct Reducer-Increaser

Standard Information

• Brand: AIR FLOW PRODUCTS
• Manufacturer Part Number: RE108