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The IMPERIAL MFG GROUP USA INC GV1351 is a 24-gauge galvanized steel taper reducer used to transition round duct from an 8-inch diameter down to a 6-inch diameter. The small end arrives crimped, allowing it to slip directly into the next duct section or fitting without additional field prep. This type of concentric reducer is a standard component in residential and light commercial sheet metal duct systems. HVAC installers and sheet metal mechanics use it wherever a duct run steps down in size to balance airflow or adapt to a smaller branch. The galvanized finish provides corrosion resistance suitable for conditioned-air applications.
The GV1351 fits into round duct systems where a straight, concentric size reduction is needed between an 8-inch main and a 6-inch branch or downstream section. It is commonly installed in forced-air heating and cooling systems during new construction or duct modification work. The crimped small end simplifies assembly by eliminating the need to field-crimp on site, reducing installation time. Each unit ships individually measured, and the supplier packages this fitting in quantities of 10 per package, making it practical for jobs requiring multiple reductions on the same run.
Designed as an OEM-style replacement and new-construction fitting for standard 8-inch to 6-inch round galvanized sheet metal duct systems in residential and light commercial forced-air HVAC applications.
Installation is typically performed by a licensed HVAC technician or sheet metal mechanic in accordance with SMACNA duct construction standards and local mechanical codes. Power down the air handler and confirm the system is de-energized before working inside any duct section connected to live equipment. Secure the fitting with sheet metal screws and seal all joints with UL-listed duct tape or mastic sealant to prevent air leakage. Do not force the crimped end into undersized fittings, as deforming the crimp will compromise the seal.
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