Osburn Part Decoking Tee

A decoking tee is a tee-shaped fitting installed in the exhaust vent run of a pellet stove system that serves two simultaneous functions. It provides the primary exhaust gas flow path through the main run of the vent pipe during stove operation, and it provides a dedicated cleanout access point through the branch of the tee that allows service personnel to access the interior of the exhaust piping for cleaning. This cleanout access allows removal of coke deposits, ash, and condensate accumulations from the exhaust vent system during routine maintenance without requiring disconnection of the full vent run.

Pellet stove exhaust systems accumulate ash particulates, condensate, and hardened coke deposits along the interior surfaces of the vent piping during normal operation, particularly in horizontal vent runs, at elbows, and at other changes in vent direction where exhaust velocity is reduced or exhaust gases cool against the pipe walls. If these deposits are not removed through regular maintenance, they progressively restrict the exhaust flow area, reducing exhaust draft and degrading the stove's combustion air management. Severe blockage can cause back-pressure in the exhaust system that disrupts combustion and may allow combustion gases to enter the installation space. Regular exhaust system cleaning through the decoking tee access point prevents this accumulation.

A damaged, corroded, or improperly sealed decoking tee creates a breach in the exhaust system that allows combustion gases — including carbon monoxide — to escape into the installation space rather than being safely directed through the vent system to the exterior. This is a serious safety hazard. Any exhaust system component showing visible damage, corrosion that has compromised the material integrity, or evidence of exhaust gas leakage such as soot deposits around joints must be replaced before the stove is returned to operation. The exhaust system must be inspected as part of routine annual stove maintenance to identify compromised components.

All exhaust venting service including decoking tee installation and replacement must be performed only when the stove is fully cooled and completely shut down. Installation by a qualified installer is strongly recommended for all pellet stove exhaust system work. All exhaust vent joints must be sealed and fastened in accordance with the pellet vent manufacturer's installation instructions to ensure consistent performance and prevent combustion gas leakage. The installation must comply with all applicable local building codes and standards governing pellet stove venting installations in the jurisdiction where the appliance is installed.

Compatibility of the SE60002 decoking tee with a specific Osburn stove model must be confirmed against the parts diagram in the owner's manual for that appliance, or by referencing the parts list available through Rural Energy or an authorized Osburn dealer. The owner's manual installation instructions and parts list will indicate the correct exhaust vent component specifications for the specific model being serviced. Before ordering any exhaust system replacement component, confirming the correct part number and vent diameter specification for the specific appliance is necessary to ensure the correct component is selected.

Exhaust system cleaning frequency on a pellet stove depends on the operating intensity, the quality of the fuel used, and the specific vent system configuration. At minimum, the exhaust system should be inspected and cleaned at the start of each heating season before the stove is returned to regular operation, and at the end of each heating season as part of annual shutdown maintenance. Stoves operated at higher feed rates, those using lower-grade pellet fuel with higher ash content, and installations with longer horizontal vent runs may require more frequent cleaning during the heating season. The owner's manual for the specific Osburn model provides the manufacturer's recommended maintenance intervals for the exhaust system.