Chimney and flue installation of Fabbri wood burning space heater with flue fan
When burning wood, it produces products of combustion which need to be expelled outside of the building to which it is installed. This is via the flue (the connection from the Fabbri to the chimney), then the chimney to the outside world.
In a natural draught chimney environment, the hot air rises the chimney which allows the cold air to enter the Fabbri which allows combustion to take place. For this to occur the flue and chimney must be kept warm in cold weather conditions or this heat will be lost from the flue gasses and the air for combustion will not arrive to the fire. This is why insulated flue is always used outside a building.
Hot likes to rise vertically not travel sideways. So, any horizontal direction will slow the flue gasses or sometimes preventing them rising. This results in smoke emitting from the Fabbri heater.
The higher the chimney the faster the hot air will rise. So, a short chimney IE less that 4 metres may have issues in creating enough draught (negative pressure) to allow the Fabbri to operate properly.
Some Fabbri models can have be supplied with a flue fan option IE F55 and F85 which will assist in creating the negative pressure in the Fabbri.. The F28 is only available as a natural draught model while the F120, F240 and the F350 are only available with flue fan.
The installation of a fabbri with a chimney is straight forward but a few general rules should be followed.