We can hear the stove collar on our woodburner sucking air in so I was going to re-seal it with fire cement, before doing this I have a question - When looking at the next section of the pipe it's a 45 degree and it looks like the straight pipe leading to it from the stove has slipped down, are these designed to expand and contract with movement or should it be rigid and it's come loose? after doing a bit of basic reading it looks like I shouldn't cement the straight pipe into the 45 but maybe should I drill 3 holes and and secure with self tappers before cementing the pipe back into the stove collar?
Cheers, Sam
![[Hearth.com] Should this 45 degree elbow be scewed together? [Hearth.com] Should this 45 degree elbow be scewed together?](https://www.hearth.com/talk/data/attachments/337/337267-079a58110a30ba4d36062148b94c49db.jpg?hash=5UFHkU-SLK)
Cheers, Sam
![[Hearth.com] Should this 45 degree elbow be scewed together? [Hearth.com] Should this 45 degree elbow be scewed together?](https://www.hearth.com/talk/data/attachments/337/337267-079a58110a30ba4d36062148b94c49db.jpg?hash=5UFHkU-SLK)