Mechanical Smoke Ventilation
Mechanical smoke extraction systems for smoke and heat extraction (MRA)
If no natural smoke and heat ventilation systems (NRA) can be installed - in multi-storey buildings, basement rooms or other interior areas - mechanical smoke and heat ventilation systems for smoke and heat extraction and mechanical ventilation are a proven safety measure. In normal operation, Colt MRA systems are used for mechanical ventilation and air extraction, in case of fire they become mechanical smoke extraction systems.
The advantage of mechanical smoke extraction over natural smoke extraction is that, regardless of the fire load, the full volume flow is present and available for the extraction of fire and smoke gases after activation.
This therefore means the following:
- High volume smoke extraction already in the initial phase of a fire, i.e. in the escape and evacuation phase, and
- high effectiveness also for smouldering fires and fires in large or high building parts with low fire loads.
The optimum areas of application for mechanical smoke ventilation systems (MRA) are in the following types of buildings:
- Single and multi-storey buildings,
- Basements and interior rooms without direct exterior walls,
- Building-related premises, such as sales areas over several floors.
Smoke extraction through mechanical ventilation
Colt's mechanical smoke and heat ventilation systems extract up to 6 kbm/sec of smoke and fumes per unit from the building when used as smoke and heat ventilation systems. They comply with EN 12101-3 class F 400 (including F200 and F300) for smoke and heat ventilation with a temperature of 400°C and a minimum operating time of 120 minutes.
Depending on requirements, mechanical smoke ventilation systems (MRA) are installed for mechanical ventilation on the roof, in the wall or within a duct system. The efficiency is similar to that of a natural smoke and heat ventilation system.
An indispensable prerequisite for the satisfactory operation of MRA systems (mechanical smoke ventilation systems) is the presence of supply air openings, whereby the supply air velocity is not limited to more than 3 m/sec. This is how mechanical ventilation and mechanical SHEVS smoke extraction works according to DIN 18232-5.
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