Mechanical winch-controlled ventilators

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Choosing a mechanical control unit

They can be installed:
Mechanical winch-controlled ventilators IN OPENING ONLY FITTINGS,

Mechanical solutions, when they can be installed, are generally cheaper:
- The potential energy needed to open the ventilator is provided by the user when it is closed again, so there is no need to provide an uninterruptible energy source,
- The components are generally the simplest.
In both cases, the smoke ventilator must be controlled as directly as possible and comply with normative constraints.


- Stand-alone modular installations,
- easy-installation,
- little maintenance,
- option to connect to larger installations using remote-controlled activators (modular winches):

  • electric remote control by current break or 24/48 VCC power supply,
  • pneumatic remote control by CO2,
  • electro-pneumatic remote control by current break or 24/48 VCC power supply.


- The links between the control unit and the devices to be manoeuvred are totally mechanical, so they must be carefully used.
- There is a need for more extensive and more frequent adjustment and maintenance than with pneumatic or electric installations.
- Power is limited by the physical capacity of an operator.
- Steel cable travel limited to 15 metres if the travel is completely visible (8 metres otherwise) and four changes of direction using pulley only.
- Possible complexity of the planned installation.
- A cable release DCM (Modular Control System) or DAC (Adaptive Control System) must only servo-control a DAS (stand-alone fire activated safety device). Choosing a mechanical control unit


- The smoke exhaust function always takes priority over the daily ventilation function.
- Ejector cylinders should be chosen according to:

  • the forces needed to open and close the ventilator;
  • the frame or ventilator profile characteristics (wood, PVC, aluminium, steel, etc.);
  • the immediate environment of the frame or the ventilator.

- Check that the installation functions before acceptance of work done.
- In the event that several control units are present, perform tests on the first safety device before fitting the following.

The main parameters to consider are:

ACCESSIBILITY/MARKING OF MATERIALS (NF S 61-932, 10-2). Control units must not be hidden by an open door, etc. Marking symbols must comply with standard NF ISO 6309, signal no.1.

REMOTE RESETTING OF SAFETY DEVICES (NF S 61-932, 8-2-4). Mandatory for any smoke ventilator and any facade exhaust opening for which the resetting unit is located more than 3m away on the closest floor. The unit used to reset the ventilator must be located in the zone where the safety devices are installed. This unit must be accessible only by authorised persons and emergency services (at least access level 1).

INSTALLING CONTROL UNITS (NF S 61-932, 8-2). he unit used to control the safety device must be located at least 180cm above floor level. When this unit is accessible at authorisation level 0, all the devices must be located together near to a main access way leading into the space in question.

OPENING TIME (NF EN 12101-2). As soon as the order for a remote-controlled system by stand-alone fire activated safety device is acceptance checked, the safety system must automatically be placed in safety position in under 60 seconds.

CONNECTION BY STEEL CABLES (NF S 61-932, 6-3). Authorised cable lengths:
- 15.00m if the device is installed completely within one space and if the cable is visible for the full length of its travel,
- 8.00m in all other cases. Transmission is by pulley only. Four transmissions maximum, maximum transmission angle 110°.

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