effeff arrester systems secure fire-retardant doors which must be kept open during day-to-day operations. As soon as smoke is detected, the retainer mechanism releases the door. Fire protection doors close automatically and prevent fire and smoke fumes entering adjacent rooms and buildings as well as limit the spread of fire.
Legislation requires fire barriers to be permanently closed. Such legislation is important as closed fire barriers are very effective in preventing dangerous smoke and fumes from spreading. However, in places such as hotels, kindergartens, hospitals and companies, passageways need to be unobstructed to ensure unimpeded access for the public and employees.
How can such conflicting requirements be fulfilled? With effeff's arrester systems. The design is quite simple, but extremely effective. Fire barriers are fitted with a door closer and a door holder. Under normal circumstances, the door holder, an electromagnet, holds the door open The public can pass through freely; company business is not hindered by the constant opening and closing of doors. Fire alarms monitor critical areas.
If a hazardous situation should arise, the fire alarms automatically detect even the tiniest concentration of smoke and fumes day and night, also at weekends and outside working hours. They then immediately transmit an alarm signal to a smoke protection switch. This cuts off the power feed to the electromagnet and the door closer closes the doors completely automatically. The spread of highly toxic smoke and fumes is thus effectively prevented. If people are still in the area affected by fire, they can escape through these doors. The door closer will ensure the doors are closed and impervious to smoke each time someone goes through.
Arrester systems for fire barriers basically consist of several components - the door holders (magnetic clamps) which hold the doors open during normal operations; In the case of an alarm or if released manually, they let go of the doors. The fire alarms, with optical smoke detectors mainly being fitted; These monitor smoke concentration in rooms. If smoke concentration increases, fire alarms switch to alarm status. This can also be done by monitoring room temperature using heat detectors. If the room temperature rises quickly to 58ºC or over, the detectors switch to alarm status. The smoke protection switch as the system's central power supply and processing unit; this unit receives signals from the fire alarms and evaluates them; in the case of an alarm or if the integrated release switch is activated, the smoke protection switch deactivates the magnets; Doors can now firmly close and thus seal off the rest of the building.