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The SEAL-TITE 4271-041207 is a 90-degree angle oval register box designed for use in residential and light commercial HVAC duct systems. This fitting connects oval ductwork to a wall or floor register, directing airflow at a right angle from the branch duct into the conditioned space. The box measures 4 inches by 12 inches by 7 inches, making it a standard size for single-room supply runs. HVAC installers and sheet metal technicians use this fitting during new construction and duct replacement projects.
This register box is suited for supply-air branch connections in forced-air heating and cooling systems. It is typically installed at the termination point of an oval duct run, where the duct meets a floor, wall, or ceiling register opening. The 90-degree angle configuration allows the duct to transition from a horizontal or vertical run directly to the register face without additional offset fittings.
Designed as an OEM-style replacement or new-installation fitting for residential and light commercial forced-air duct systems using oval branch ductwork.
Installation should be performed by a qualified HVAC technician or licensed sheet metal contractor. Shut down the air handler or furnace and verify the system is de-energized before beginning duct work. Secure the register box to framing or subflooring per local mechanical code requirements, and seal all connections with listed duct sealant or foil tape to minimize air leakage. Follow applicable SMACNA standards and local mechanical codes for duct installation and support.
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