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The CENTROTHERM isell0387-10 is a single-wall polypropylene (PPs) long elbow fitting designed for residential and commercial venting systems. Part of the InnoFlue venting line, this 87-degree elbow handles directional changes in exhaust vent runs with minimal labor. The fitting ships with an integrated EPDM gasket that creates an airtight seal at every joint connection without requiring glues, primers, or solvents. Evaluated to UL1738 and ULCS636 by ICC, it meets the certification standards required for Category II, III, and IV gas appliance venting. The lightweight PPs construction resists condensate and flue gas corrosion for long service life.
The isell0387-10 is suited for direct-vent and non-direct-vent exhaust systems on high-efficiency boilers, furnaces, and water heaters that require polypropylene vent pipe. The long-radius 87-degree elbow geometry reduces turbulence at offset transitions, supporting consistent draft performance. This fitting is appropriate for both indoor and outdoor installation locations, making it a practical choice when vent runs must exit through a wall or navigate structural obstacles. Licensed HVAC technicians and plumbers typically install InnoFlue components as part of a complete PPs vent system.
Designed as an OEM-style component within the InnoFlue single-wall polypropylene vent system for use with Category II, III, and IV gas appliances requiring a 3-inch PPs vent connection.
Installation of polypropylene flue venting components should be performed by a licensed HVAC technician or plumber in accordance with the appliance manufacturer instructions and applicable local mechanical codes referencing IFGC or IMC standards. Shut down and allow the appliance and existing vent system to cool completely before disassembling any joints or inserting new fittings. No adhesives or primers are required; confirm each EPDM gasket is properly seated before locking the joint. Do not mix InnoFlue PPs fittings with vent components of a different material or certification class without verifying cross-system compatibility.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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