Fire Extinguishers should carry Factory Mutual (FM) or Underwriters' Laboratory (UL) approved label. Should be inspected annually. Should be distributed in sufficient numbers in conspicuous locations throughout the buildings, i.e., hung no more than five feet from fire hazards. They should be where they will be easy to reach and remove, but placed where they will not be struck and damaged. Types and use:
- Water pressure- for class "A" fires (ordinary combustibles, wood, paper, cloth, trash, must be protected from freezing). Do not use on burning liquids or electrical fires. Contains 2 1/2 gallons of water (or water and anti-freeze) with air pressure of 100lbs. per square inch, which can be read on dial near the handle. To operate, pull safety pin (twist if you encounter difficulty breaking plastic seal), squeeze handle, and direct water stream to base of fire, sweeping from side to side. Watch for re-flash or re-ignition, move in close, pull apart the burned area to get at the hot spots. Discharge the contents of the extinguisher. Remove burning article form building when safe to do so.
- Carbon Dioxide (CO2)- smothers fire. Should be used on class "B" fires- flammable liquids such as oil, gasoline, paint, solvents, thinners, and grease, or, class "C" fires - electrical fires such as burning motors, controls, wiring. Remove from mounting, flip up horn, pull ring pin and break seal - twist if you have to. Approach the fire as closely as possible, squeeze the handle and direct the discharge to the edge of the fire and work in, sweeping back and worth. Guard against re-flash or superheated flammable or combustible liquid. Expend extinguisher, get second extinguisher, repeat cooling and smothering process.
- Dry Chemical- smothers fire. Fore class "B" and "C" fire. Contains a power that blankets liquid or electrical fires. Pull pin, break seal. Aim nozzle at base of fire. Press or squeeze handle and sweep back and forth. Discharge contents. Obtain second extinguisher and guard against re-flash.
- All Purpose or Multipurpose Dry Chemical - Smother fire. For Class "A," "B," and "C" fires, most versatile type. Operate the same as Dry Chemical.
- Dry Powder for Combustible Metals - chemical reaction with burning metal. Should be located in laboratories containing highly unstable metals. For class "D" fires. operate as with Dry Chemical.