Flues, chimneys and air vents play a vital role in the safe operating of gas appliances. Flues and chimneys allow products of combustion to escape from your home. Air vents ensure there is a good supply of combustion air (ventilation) to appliances. For this reason you must keep all flues, chimneys and air vents clear.
Never block these airways to prevent a draft. Blocking ventilation is dangerous and could result in carbon monoxide building up in your home.
Have chimneys checked every year, no matter how much you use the fire, to make sure there are no blockages and fumes can escape freely. The Gas Safe registered engineer will check for bird’s nests, leaves and other natural debris, they could be blocking the exit.