Imperial Mfg Group Usa Inc GV1418 Taper Increaser 3x4 24GA

Product Description

The IMPERIAL MFG GROUP USA INC GV1418 is a 24-gauge galvanized steel taper increaser designed to transition round duct from a 3-inch diameter to a 4-inch diameter. The large end is crimped for easy slip-fit insertion into the next duct section without additional tools. This fitting is a standard component in residential and light-commercial forced-air HVAC systems wherever a duct run requires an incremental size step-up. HVAC sheet metal installers and ductwork fabricators typically specify this type of fitting to manage airflow transitions within supply or return trunk layouts. The 24-gauge galvanized construction provides corrosion resistance suitable for typical interior duct applications.

This taper increaser is used in round duct systems where a step-up transition is needed between a smaller and larger diameter duct section. Common install scenarios include branch-to-trunk connections, equipment outlet transitions, and inline duct expansions in residential forced-air systems. It ships in a package quantity of 10 units, making it practical for contractors stocking fittings for multi-unit jobs or service vehicles.

Key Features

• Transitions round duct from 3 inches to 4 inches in a single fitting
• 24-gauge galvanized steel construction for corrosion resistance
• Large end crimped for slip-fit assembly into adjacent duct sections
• Packaged in quantities of 10 for contractor convenience
• Taper increaser profile maintains smooth airflow through the transition

Compatibility

Designed as an OEM-style duct fitting compatible with standard 3-inch and 4-inch round galvanized duct systems used in residential and light-commercial forced-air HVAC installations.

Installation Notes

Installation is typically performed by a licensed HVAC technician or sheet metal installer. Power down the air handling unit and verify the system is de-energized before working on duct sections. The crimped large end is designed to insert into the female end of the next fitting or duct collar; secure with sheet metal screws and seal all joints with UL 181-listed duct tape or mastic per applicable mechanical code requirements. Do not force the fitting into undersized collars, as deforming the gauge material will compromise the seal.