A Gas Safety Check Benfleet engineer will verify the ventilation in both room, look at various combustion

https://lanedsal722.zenbloomer.com/posts/gas-safety-inspection-benfleet-the-signs-your-appliance-needs-attention

A Gas Safety Check Benfleet engineer will look at various the air flow in every single room, experiment combustion, and test that flues should not blocked or incorrectly equipped.