PASS is the mnemonic taught on almost every extinguisher course: pull the pin, aim at the base of the fire, squeeze the handle, sweep across. It is a good summary of the mechanical operation of a unit and it is not a decision procedure. The decisions that matter most happen before the pin is pulled, and any training that starts at P has skipped them.
What the four steps are for
Pull removes the safety pin, which also breaks the tamper seal and is the reason a broken seal means a unit may have been discharged. Aim at the base because the fuel is what has to be treated, not the visible flame above it. Squeeze because a controlled discharge lasts longer than a burst. Sweep because a single point of attack leaves the rest of the fuel bed burning.
The decisions that come first
Has the alarm been raised. Is there a clear route out behind the person, still clear if the fire grows. Is the fire small enough that one extinguisher is a realistic answer. Is this the right agent for the fuel. Is anybody else being asked to wait while this is attempted. A no to any of these means leaving, and that is the outcome training should make easy rather than shameful.
Discharge time is shorter than people expect
A portable extinguisher runs for a matter of seconds, not minutes. Practical training on a live fire rig is what makes that real; without it people plan as though they have a hose. Knowing the run time is what turns the sweep step from a technique into a budget.
Position while using it
Back to the exit, upwind where there is a draught, at the limit of the effective range rather than close in. For a class B fire the approach is off a surface rather than straight at the pool. None of this is in the mnemonic, which is the argument for practical rather than slide based training.
The pass system fire training teaches, and where it stops
Pull, aim, squeeze, sweep is a technique for a fire you have already decided to fight, and the deciding is the part the mnemonic leaves out. Before any of the four steps: is the alarm raised, is there a clear way out behind you, is the fire small enough that one extinguisher could plausibly deal with it, and is the right agent to hand. If any of those is no, the answer is to leave and close the door. Training that spends its whole time on the sweep and none on the decision produces people who approach fires they should have walked away from.
Fire classifications decide whether to pick it up at all
Fires are grouped by what is burning and the group decides the agent. Ordinary combustibles, flammable liquids, flammable gases, metals, electrical equipment and cooking oils each behave differently, and two of those groups make things worse with the wrong extinguisher: water on live electrics conducts, and water or foam on burning oil ejects the oil. So the class is not an academic label, it is the question of whether the unit in your hand is a help or an accelerant. The pictograms on the body are the quickest way to check, and they are on every compliant extinguisher for that reason.
What the fire extinguisher tags tell you before you pull the pin
Two things, in a second. The service label carries the date of the last engineer visit and the type of service done, so an out of date label means the unit may not hold its pressure. And the gauge, on the types that have one, shows whether it is still charged: a needle outside the green means it will either not discharge or will discharge weakly. Neither is a formality at the moment of use, because a unit that has quietly lost pressure looks exactly like a full one from across the room, and the tag is the only difference you can see.
AFFF fire extinguisher and fire extinguisher foam: the same agent, two names
Aqueous film forming foam is the foam in most red bodied units with a cream label, and it works by covering a burning liquid with a film that cuts off the oxygen rather than by cooling alone. In use it wants a different technique from water: aimed at a surface behind or beside the fire so it flows over it, never fired straight into a pool of liquid, which throws the liquid out of the container. Fluorine free replacements are now common as the older chemistry is phased out, and they behave slightly differently, which is a reason to read the body of the unit you actually have rather than the one you were trained on.
Questions people ask about pass for fire extinguisher
Is the pass in fire extinguisher training a legal requirement?
The law requires adequate fire safety training for employees, and where extinguishers are provided for staff use the training has to cover using them. The mnemonic is one common way of delivering part of that.
Should everybody be trained to use an extinguisher?
That is a decision for the risk assessment. Some buildings train nominated people only and instruct everybody else to leave, which is a legitimate and often safer arrangement.
How often should the training be repeated?
Frequently enough that it is current, and again whenever the risks, the people or the provision change. An annual refresher is common practice in buildings where staff are expected to act.
Is water fire extinguisher use different from foam?
Yes, in both aim and target. Water cools, so it is swept across the base of a fire in ordinary combustibles such as paper, wood or textiles, and it is used at a distance because a jet close in scatters burning material. Water must never go near live electrical equipment or cooking oil. Foam covers as well as cools, which is why it is the better choice for a liquid, and it is applied so it runs onto the surface instead of into it. A building with both should have them where the risk each answers actually is, rather than in matching pairs by the door.
Does the fire extinguisher holder matter?
More than it sounds. An extinguisher on the floor gets moved, gets things stacked on it and gets wet, and a unit nobody can reach in three seconds is a unit that will not be used. A bracket or stand at the right height on the escape route, with a sign above it visible from a distance, is the arrangement inspectors expect and the one that works, because the point is to meet the extinguisher on the way out rather than to go looking for it. The holder is also what keeps the unit off a wet floor, which is what corrodes the base.
Are fire extinguisher checks near me something a contractor has to do?
Split it in two. The monthly look, that each unit is in place, unobstructed, undamaged, pinned and in the green, is a job for somebody on site with a log and needs no contractor. The annual service is an engineer's visit to the British Standard. A contract that sells monthly attendance is selling you what you can do yourself; a contract that never mentions the monthly log has left the gap that fails inspections most often. Search locally for the annual service, and give the monthly check to a named person in the building.