Rami recently asked the question “Can I use the sounder circuit to trigger smoke exhaust fans via relay?” to our Ask The Expert on www.conceptfire-uk.com
Our expert answered as follows:
Unfortunately, I can’t see how you could do this at the correct time as you would only need to operate the exhaust fans after a fire has been extinguished as operating them during a fire could potentially fan the flames.
We would always install a separate switch operated manually via a key, this
should not be powered by the control panel power supply but separately. Some Fire Suppression Panel manufacturers offer a relay to operate this from the panel, but not automatically.
To expand on the above answer and to explain further, operating a fan when a fire has been potentially detected would create a number of issues:
- Extract any Fire Suppression Gas Agents that are being used to extinguish the fire.
- Provide additional Oxygen to the fire thereby fanning the flames.
- Spread the fire to other areas as the fire is fed Oxygen.
The best way to operate any Smoke Extraction System is via a manual button preferably a key-switch and this should only be operated by a suitably qualified person after first asking the Fire Service for permission to extract.
For information on Smoke Extract Fans or Over Pressure Vents please contact us from our website
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