If you look at the picture you will see that I have used a pressurized tank, an expired propane tank to be exact. I have no water source at this location because of freezing. The tank is 1/2 full of a water/glycol mix, under 120 psi air. The temp sensor is located on top of the blue drum, my vacuum collector. The temp sensor's logic was backwards so I added a relay to rectify that. In order for a fire in the vacuum to escape it will have to do so in the upper portion of the drum which will trip the switch and open the valve.
The vacuum exhaust is directed outdoors via a metal pipe (not shown in photo) |