Looking at Chimneys and Chimney pots on a roof.
Gas fire has been fitted to a flue but its not allowed. Always check your chimneys.
Flue flow and spillage test.
If the flue needs sweeping get it swept.
Flue that are suitable and flues that are not. Chimney pots not suitable for gas fires.
Make sure you always check the full length of the flue. New pots would be better but know is going to pay for it.
Viva Training Academy talking about different flue systems.