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The CENTROTHERM 250405108080 is a 3-inch gasketed polypropylene vent elbow with a 45-degree sweep, designed for use in direct-vent and concentric flue systems on high-efficiency gas appliances. The polypropylene construction resists the acidic condensate produced by condensing furnaces and boilers, and the integrated gasket ensures a sealed, leak-resistant joint. This elbow is rated for service up to 230 degrees F, making it suitable for Category IV venting applications. HVAC technicians and plumbers install this fitting as part of listed polypropylene vent systems where rigid direction changes are required in the flue or combustion-air piping.
This elbow is used in residential and light-commercial venting installations for condensing gas furnaces, boilers, and water heaters that require polypropylene flue pipe. The 45-degree angle allows for moderate directional offsets in both horizontal and vertical vent runs. It is suited for installations where the flue must navigate obstructions or transition between wall penetration angles without exceeding the tight-radius clearances that a 90-degree elbow would impose.
Designed as a replacement or extension component for 3-inch polypropylene vent systems used with condensing gas furnaces, boilers, and water heaters requiring Category IV flue venting.
Installation should be performed by a licensed HVAC technician or plumber in accordance with the appliance manufacturer instructions and applicable mechanical codes such as the IFGC. Shut down and isolate the appliance from gas and electrical supply before servicing any vent components. Ensure the gasket is properly seated before joining sections, and support all horizontal vent runs at intervals required by the vent system listing. Do not use with PVC or ABS vent pipe not rated for condensing flue applications.
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