Balanced flue gas fire drafts

[Kell]

I have just had a inset balanced flue gas fire installed and at the bottom there is a 1.5 in hole through which the gas supply pipe comes into the firebox and I now have a bad draught coming in. Surely this is not right? can anyone give me advice ?

[ktitley]

theres usually a rubber seal that the pipe goes through to prevent this which the fitter should have put on