A room with a blocked chimney needs only about half the heat compared with rooms with open chimneys, so it makes sense to fit a chimney balloon in every chimney which is not in everyday use.
The chimney balloon is made of a special laminate of three plastics to make it airtight, tear-resistant and long-lasting. It also has a special shape that allows a little ventilation on two corners to keep your chimney dry. Using a chimney balloon is completely safe: if it is accidentally heated, it shrivels and deflates.
Inflate your chimney balloon by mouth inflation tube or air bed pump.
Before lighting a fire deflate it by opening the tap and then remove it.
Store it to use again and again.