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The IMPERIAL MFG GROUP USA INC GV0808-A is a 24-gauge galvanized steel taper reducer designed to transition round duct from a 4-inch diameter down to a 3-inch diameter in forced-air HVAC systems. The small end arrives factory-crimped for direct insertion into the next duct section or fitting without additional field modification. This fitting is a standard component in residential and light commercial supply trunk-to-branch transitions and is installed by sheet metal workers and HVAC technicians during new construction or system modification work. The 24-gauge galvanized construction provides corrosion resistance appropriate for interior ductwork applications.
This taper reducer is suited for residential and light commercial forced-air duct systems where a reduction from 4-inch to 3-inch round duct is required. Typical applications include branch takeoff transitions from supply plenums or trunk lines feeding smaller-diameter flex or rigid duct runs. It ships in a package quantity of 10 units, making it practical for contractors stocking fittings for multiple jobs. The factory crimp on the small end speeds installation and ensures a consistent fit.
Designed as an OEM-style replacement and new-installation fitting for 4-inch to 3-inch round duct transitions in residential and light commercial forced-air HVAC supply systems.
Installation is performed by licensed HVAC technicians or qualified sheet metal workers. Power down and lock out the air handling unit before working in the duct system. Secure the fitting with sheet metal screws and seal all joints with UL 181-listed duct tape or mastic sealant per local mechanical code requirements. Do not use this fitting in applications outside its rated gauge or diameter without engineering review.
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