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The CENTROTHERM isels0445-6 is a single-wall 45-degree elbow fitting with a long socket, designed for use in direct-vent or exhaust piping systems. The 4-inch diameter fits standard flue and intake runs where a controlled directional change is required. The long socket design provides additional overlap for a secure, sealed connection between pipe sections. This fitting is typically installed by licensed HVAC technicians and plumbers working on condensing appliance venting or similar low-temperature exhaust applications.
This elbow is suited for residential and light commercial installations where a 45-degree transition is needed within a straight pipe run. It is commonly used in condensing furnace, boiler, or water heater venting systems that require single-wall plastic or specialty exhaust piping. The long socket configuration simplifies alignment during installation and helps maintain a tight, consistent joint along the vent run.
Designed as an OEM-style replacement or system component for single-wall 4-inch exhaust and intake vent piping used with condensing appliances such as furnaces, boilers, and water heaters.
Installation should be performed by a licensed HVAC technician or plumber in accordance with the appliance manufacturer instructions and applicable mechanical codes. Shut down and de-energize the appliance before disconnecting or modifying any vent piping. Ensure all joints are fully seated and sealed per the vent system manufacturer guidelines before returning the appliance to service. Verify that the completed vent run meets all clearance and slope requirements specified in the local mechanical code.
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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