Ideal classic ff250 flue question

[R1kdk]

I have recently noticed that where the flue pipe joins the 90degree fitting inside boiler case there is a hole about 10mm in the middle pipe.
Does this mean the gas am moisture from the exhaust side of it will a get into my boiler case and the moisture damage the parts and b it will not be drawing all clean air from outside due to this hole.
If so should it be covered with heat resistant flue tape?

 

[ChrisR]

They're all like it, sir! Never heard a really good explanation as to why !

 

[R1kdk]

Thanks so the gases and moisture do no damage?

 

[ChrisR]

NO.

 

[twgas]

Interesting that you just happen to notice this hole, did you have a problem with the boiler that made you take the casse off, which is in fact a job for RGI as the case on these should be sealed and the seal check when reinstated.