The PASS technique is a feature of basic fire extinguisher safety. PASS is an acronym that stands for: Pull, Aim, Squeeze, Sweep. You must first pull out the pin on the top of the fire extinguisher. Then you should aim the nozzle at the base of the fire. You should then squeeze the handle at the top of the canister, and sweep the [nozzle](https://en.wikipedia.org/wiki/Nozzle) back and forth across the base of the fire until the flames are fully extinguished.