Don’t block ventilation
It is dangerous to block ventilation to your fuel-burning appliances. If you block ventilation to your appliances it can lead to Carbon Monoxide poisoning.
Fuel-burning appliances need a consistent supply of air in order for complete combustion to occur and for the appliance to work correctly. If you are concerned about drafts in your home, you should speak to your installation specialist who may be able to recommend a different location in your home for the appliance to be relocated.
If you use a solid fuel burning appliance you should have your chimney swept at least once a year, preferably before each winter, as birds’ nests and spider webs can block chimneys and stop the flow of air.