Self Extinguishing Inline Pre Filter – Firebox100:
In the very rare event that a burning ember or spark is drawn into the fume extraction unit it may be possible that the filters will ignite. Whilst any resultant fire would typically be retained within the fume extraction unit, the damage to the extractor would be significant and in extreme circumstances the risk may extend beyond just the extraction unit. For processes where such risks have been identified it may be prudent to introduce additional protection in the form of an in line firebox.
How the fire extinguisher works:
The fire extinguisher discharge mechanism consists of a patented design consisting of special plastic hose that is coiled around the inside of the filter box lid, which dispenses the fire retardant in the event of a fire, protecting the fume extractor and other close equipment.
Operation:
The extinguisher activating coil will discharge the powder if the temperature on its surface exceeds 63º C. The extinguisher unit can also be used to switch a 230vac (13A) supply, for example; the extraction unit.
The temperature sensor:
As a secondary measure the filter unit has a temperature sensor that is positioned in the air flow path. This sensor can be customer set to measure the temperature of the air flow in case a fire develops back up line from the filter face itself. For example if a fire were to develop in the pipe work leading to the filter unit the temperature sensor would sense this and disable the contactor. This contactor could be used to disable the supply to the extraction unit (max 230V / 13A).
The Coil:
The purpose of this specially designed coil is to deploy the fire retardant at the point at which the flame melts the pipe. Once the fire extinguisher has been discharged a pressure switch will disable contactor used to switch the 230vac (13A) supply
