MECHANICAL SMOKE EXTRACTION (MRA)

In complex buildings, such as airport terminals, smoldering fires that are detected late can quickly lead to disaster. Mechanical smoke extraction systems (MSAS) provide a higher level of safety. They create smoke-free layers along escape and rescue routes, allowing people inside the building to evacuate independently . Smoke extraction fans draw out smoke gases in a controlled manner to prevent uncontrolled smoke spread and enable firefighters to quickly extinguish the source of the fire.

Mechanical smoke extraction systems remove not only the smoke but also the heat , thus delaying a flashover. The supply air openings necessary for smoke extraction open simultaneously.

• Low flow velocities should exist at the interface between the flue gas and smoke-free layers in both vertical and horizontal directions.
• Air inlets must be adequately sized and optimally distributed in terms of airflow. They must open automatically before the smoke extraction fans are switched on.
• The supply air flow into the smoke compartment must be significantly below the flue gas layer and with as little momentum as possible, at a low flow velocity (< 3 m/s). 
• The smoke vents should be evenly distributed and located as high as possible in the smoke compartment. 
• The smoke compartment areas must be limited depending on the required low-smoke layer, the heat capacity of the surrounding building components and the fire output to be taken into account. 
• The condition of the fans must be checked regularly. The integrated X-FANS diagnostic system helps to detect any damage early, thus enabling condition-based maintenance. 
• Smoke control and differential pressure systems: Smoke control systems are designed to keep escape and rescue routes, especially fire stairwells, free of smoke. The supply air flow must be directed from the areas to be protected towards the fire area.

Did you know that the real danger in a fire doesn't come from the heat or the flames? In fact, most people die from toxic fumes, which not only pose a threat to life and limb but also hinder firefighting efforts and thus the rescue of people, potentially even making it impossible.

TROX X-FANS recognized this problem as early as 1971 – and at that time developed the first fan that could quickly and efficiently extract dangerous smoke gases from a building in the event of a fire . The smoke extraction fan was born and has been continuously developed and modernized ever since.

TROX X-FANS classic smoke extraction fans are available for temperature ranges F200, F300, F400, and F600. All smoke extraction fans are certified and safe.  They have been tested and CE-certified by the Technical University of Munich and the MPA Braunschweig according to EN 12101 , Part 3 .

Due to increasingly complex systems, smoke extraction fans may now also be operated via frequency converters in the event of smoke extraction. For this purpose, the smoke extraction fans with a special frequency converter have been certified according to DIN EN 12101-3.