Just remember that CO2 displaces oxygen and could cause the operator to have oxygenation problems as a result of this displaced Oxygen - As a volunteer Paramedic and firefighter, I have witnessed this 1st hand - A person had a fire on a table saw in a closed shop - upon arrival, we not only had to secure the fire, but the person himself - if it wasn't for the fire department responding, the shop owner could have died because of the CO2 displacing the available Oxygen in the enclosed structure - use CO2 or sand, but whatever you choose, be save - you can always replace material things, but you cannot restore life no matter how much you try! :thinking: