There are vast differences between the types, sizes, and even construction among fire extinguishers! These attributes all play a role in determining whether or not an extinguisher is “commercial grade.” At a minimum, extinguishers must have a metal shell AND metal head mechanism to be considered suitable for commercial use. Depending on the environment, the extinguisher may be subject to additional requirements such as having a pressure gauge and/or being of a certain size or rating. Almost all commercial grade extinguishers will have pressure gauges to indicate whether or not the unit is charged; excepting Carbon Dioxide extinguishers which do not have pressure gauges.
The majority of extinguishers on the market currently, both commercial and residential, have metal bodies. But most residential units have plastic head mechanisms; the construction of which makes the units unable to be serviced. Since these units cannot be serviced or recharged at regular intervals, they are not considered suitable for commercial use. Learn more about plastic head units here. Commercial grade extinguishers are able to be emptied, recharged, and hydrostatically tested. Service intervals are dependent on the extinguisher type; the most common extinguishers, ABC Dry Chemical units, are serviced every six years from manufacturer’s date. Extinguishers labeled for “one time use” or “recycle after use” cannot undergo service and, thus, are not considered commercial units. As a general rule, all commercial grade extinguishers will have:
- Metal shell usually made from aluminum or steel
- Metal head mechanism (where the handle is located)
- Pressure gauge indicating charge
- Use/direction label
- Ability to be recharged/serviced
