A Gas Safety Check Benfleet engineer will assess the air flow in every single room, verify combustion

https://angelowito965.urbanvellum.com/posts/gas-safety-check-benfleet-making-sure-every-appliance-is-accounted-for-3

A Gas Safety Check Benfleet engineer will assess the ventilation in both room, try combustion, and make sure that flues aren't blocked or incorrectly outfitted.