Seal-tite 106243 Round Reducer 4 X 3 Inches

Product Description

The SEAL-TITE 106243 is a round duct reducer designed to transition airflow from a 4-inch round duct to a 3-inch round duct in sheet metal duct systems. This fitting is used in forced-air HVAC systems where duct runs must step down in diameter to match branch takeoffs, terminal equipment, or reduced-flow zones. HVAC technicians and sheet metal workers install this type of reducer during new construction ductwork fabrication and service replacements where airflow balancing or branch resizing is required.

This round reducer is suited for residential and light commercial HVAC duct systems. It connects a 4-inch main or branch run to a 3-inch downstream section, making it appropriate for bath exhaust, supply air branches, or zone distribution applications where a diameter step-down is needed. It is installed in sheet metal duct assemblies and is compatible with standard round duct fittings of the corresponding sizes.

Key Features

• Transitions airflow from 4-inch to 3-inch round duct diameter
• Sheet metal construction for durability in forced-air duct systems
• Standard sizing for compatibility with round duct fittings and components
• Suitable for supply, return, and exhaust duct applications requiring a step-down fitting

Compatibility

Designed as an OEM-style replacement or new-installation fitting for residential and light commercial round sheet metal duct systems using 4-inch and 3-inch diameter duct sections.

Installation Notes

Installation is typically performed by licensed HVAC technicians or sheet metal workers. Power down the air handling unit or furnace before accessing ductwork. Secure the reducer to adjoining duct sections using sheet metal screws and seal all joints with UL 181-listed foil tape or duct mastic to prevent air leakage. Follow applicable mechanical codes, including SMACNA duct construction standards, for proper fitting and joint sealing requirements.

Technical Specifications

• Inlet Diameter: 4 inches
• Outlet Diameter: 3 inches
• Fitting Type: Round Reducer

Standard Information

• Brand: SEAL-TITE
• Manufacturer Part Number: 106243