Chimney liner question

[Michael B]

We had a forever flex chimney liner installed in our exterior cinder block chimney last fall. Mid winter I went to clean out the clean out and found that there's a cap at the bottom of the liner which runs just below the tee section where it enters the house. Every few weeks all winter I removed the interior pipe from the stove and wall and shop vac'd the tee area. Is there supposed to be a cap there? I assumed that the clean out would remain functional but that's not the case. is this normal or should I be contacting my chimney guy?

FYI, we heat exclusively with wood in a Nashua stove with blower.

Thanks

 

[BrotherBart]

Yep. Gotta have that cap. If you didn't air would pull from the open end of the tee instead of through the stove and you would have lousy draft and a creosote factory on your hands due to it cooling the flue.

 

[Michael B]

Makes sense. Thanks I have lots of build up already due to heating exclusively with wood and having it closed up and burning slow overnight and all day while no one is home... keeps me busy cleaning things....