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Cab lift ventilation: what the new legislation says

The ventilation of the lift cabin is a very important aspect, precisely for the purposes of plant safety. Precisely for this reason, when you decide to install a device for the vertical transport of things and people, you need to know by wire and by sign what the law requires. In this case, the main reference point consists of the EN 81-20 standard, then implemented within a decree that came into operation in 2017. One of the annexes explaining the European standard, the one marked with the initials E3. 1, goes to specify with absolute clarity how the running compartment and the engine rooms must be ventilated. The standard, however, does not provide specific requirements regarding the ventilation of these areas, a consequence of the fact that the compartment and the machine room are usually included in a complex building construction.
Responsibility for the correct ventilation of the lift cab is also to be passed on to the customer, to whom the lift company must make the design reference values ​​available to ensure sufficient ventilation.
In the SIA 382/1: 2014 standard «Ventilation and air conditioning systems – General requirements» were
defined the classes of indoor air in the various rooms of the building, where people remain for a long time.
The lift cabin must be equipped with ventilation openings to ensure air quality
breathable in the cab during the usual operation of the lift or in the event of an emergency.

ventilazioneCab lift ventilation: what you need to know

Regarding the ventilation of the lift cabin, you should also remember some absolutely essential things:
– the maintenance of mechanical ventilation systems must be guaranteed from the outside of the shaft, engine room or pulley room, as required by EN81-20;
– the air intake in the run compartment can take place at most three meters above the last lift stop;
– EN ISO 13857 prescribes instead that the opening for the introduction and expulsion of the air must be protected in order to prevent its possible achievement;
– as regards the possible range of temperatures for the shaft and engine room, it must oscillate between a minimum of 5 and a maximum of 40 degrees Celsius;
– the waste heat from the drive and elevator control devices must in turn be considered separately;
– it is then necessary to specify that the travel compartment, the machinery, controls and pulleys’ rooms can not be used for the ventilation of rooms which are not an integral part of the lift;
– ventilation must be carried out with the aim of protecting the engines and the equipment, starting from electric cables, dust, harmful gases and humidity;
– in the case of the stroke compartment, ventilation can be carried out mechanically if the rooms used by the elevator also benefit from a mechanical ventilation device, whose operation must be guaranteed even if the lift is disconnected from the electric network;
– another important clarification is that relating to the fact that the air can be introduced from areas near the runway (eg from the stairs of the house) if they are also ventilated, but not where it comes from another area of fire safety;
– on the other hand, as regards the expulsion of the air in the racing compartment, the corresponding opening must go above the highest position of the cabin, in the so-called safety zone A, ie the one that extends between the roof of the cabin and the ceiling of the run compartment, while the expelled air must be directed towards the outside;
– finally, the last prescription concerns the mechanical device for inlet and expulsion of air in the run compartment, which can be used only and exclusively for this area.