The installation of a specific exhaust fan for barbecues and chimneys is the solution to increase the chimneys draught (fireplaces) and prevent the room where it is installed is filled with smoke.
The chimney extractor fans carry out the evacuation of the smoke towards the outside with the enough force to extract it through the duct, but also not to generate an excessive air current that would cause a greater consumption of firewood or combustible element.
In addition to the fan, which can be a FOCCETA, a CTH-3 A or a CTH-4, we recommend installing a speed regulator that will adapt the air-flow according to the fire (depending on whether there are more or less, or only embers) . This regulator can be perfectly the REG of Casals for single phase and SFC for three phase.
The fan must be running as long as the fire is lighted or there are embers. In addition, the fan must be installed enough far away to avoid get burnt with fire and resist the smoke temperature, between 100 and 200ºC depending on the type of fuel and the distance or length of the duct. In the case of FOCCETA, the resistance is up to 200ºC.
For this reason it is so important to calculate the correct air-flow and it will be necessary to take into account the size of the barbecue or fireplace opening.
To know how to calculate the flow rate of a chimney or barbecue fan, we need to know the surface area (m2) of the fireplace opening or openings.
An air supply to the room will always be necessary, and it can be natural (any opening) or forced (a fan).
For this forced ventilation, any small flow-rate fan will be used within the residential range of Casals.