How to Check a Home Fire Extinguisher and Teach PASS

Why this matters

Most home extinguishers are bought once, hung on the side of a cabinet next to the stove, and never looked at again. Years later the gauge still reads green, the customer feels covered, and the unit is past the age its own maker and the standard give it, or its pin is gone, or it is mounted where reaching it means reaching across the fire. A tech on a maintenance visit can check one in two minutes and, more usefully, spend another two showing the customer how to use it and when not to. The check is visual; nothing on this card involves discharging, refilling or servicing an extinguisher, which for a rechargeable unit is work for an extinguisher service company.

What the letters and numbers on the label mean is owned by its own card: see related, What a Fire Extinguisher Rating Actually Means. Commercial placement and the monthly inspection tag belong to: see related, Fire Extinguisher Placement and the Monthly Tag.

What the label and gauge are telling you

Here is the label and gauge of a typical home unit, with the readings this card uses marked.

+--------------------------------------------+
| MULTIPURPOSE DRY CHEMICAL EXTINGUISHER     |
| UL RATING       2-A:10-B:C                 |
| AGENT           monoammonium phosphate     |
| CHARGE          5 lb                       |
| NONRECHARGEABLE. REPLACE AFTER ANY USE.    |
| Instructions: PULL - AIM - SQUEEZE - SWEEP |
+--------------------------------------------+
  stamped on cylinder bottom:  13   (= 2013)

  GAUGE:  RECHARGE  |    GREEN     |  OVER
          (empty)   |      ^       | CHARGED
                    |  needle here |

  pin: in handle    tamper seal: intact
  hose: no cracks   valve head: plastic

Four things on it decide the check:

• The rating. The letters say what classes of fire it is listed for: A for ordinary combustibles such as wood, paper and fabric; B for flammable liquids such as gasoline and solvents; C for fires involving energized electrical equipment, meaning the agent does not conduct. The numbers are relative capacity. A unit marked A, B and C is the multipurpose kind.
• Rechargeable or not. A plastic valve head and "nonrechargeable" or "disposable" on the label means the unit is replaced, not serviced, after any use or at the end of its life. A metal valve head usually means rechargeable.
• The manufacture date. Usually a year stamped into the cylinder bottom or printed on the label, sometimes as two digits. NFPA 10, which governs extinguishers in the occupancies that adopt it (businesses and multifamily common areas, not normally a private home), in substance removes nonrechargeable dry chemical units from service 12 years after the date of manufacture; check the current edition. A private home is rarely bound by it, but it is the best benchmark there is, and the manufacturer's manual usually agrees with it.
• The gauge. The needle in the green band means the stored pressure is within its operating range. Left of green means it has lost pressure; right of green means it is overcharged. Green does not mean the agent is in good shape or that the unit is in date. It means the pressure is right.

The steps

1. Find every extinguisher in the house and where it hangs. Kitchen, garage, workshop, near a fireplace or wood stove, in a basement with the furnace. Note where each is mounted. An extinguisher in a closet behind the vacuum is one nobody finds in a hurry.

2. Read the gauge. Needle in the green passes. Anywhere else, the unit goes out of service: replaced if nonrechargeable, sent to a service company if rechargeable. Tap the gauge face lightly once; a needle that jumps was stuck and the reading cannot be trusted.

3. Check the pin and tamper seal. The pin should be in the handle and the plastic tamper seal unbroken. A missing pin means the handle may have been squeezed. A broken seal with the pin in place may mean someone pulled it and put it back. Either way, a unit that has been even briefly discharged can lose pressure over the following weeks, and a dry chemical unit partly used is not one to trust. Treat it like a gauge failure.

4. Look over the body, hose and nozzle. Dents, rust, corrosion at the seams, a cracked or brittle hose, a nozzle blocked with dirt or an insect nest, or a label too faded to read all take it out of service. Lift it from its hanger and feel its weight: a unit noticeably lighter than its twin, or than it feels like it should, may have lost agent. Where the manufacturer's manual tells owners to invert and shake a dry chemical unit periodically to keep the powder from packing, show the customer how; where it does not, leave it.

5. Read the date and do the arithmetic. Current year minus the manufacture year. A nonrechargeable unit at 12 years or more is replaced. A rechargeable unit carries its own service intervals in its manual and on any service tag, and those are for the service company to apply.

6. Check where it hangs. An extinguisher belongs on the path you would use to leave, so you can fight a fire with your exit behind you, and within easy reach of the hazard rather than next to it. In a kitchen that means near the doorway or across the room, not on the cabinet side beside the range, where a pan fire puts the flames between you and the handle. Hang it where an adult can lift it off without a step stool; NFPA 10's rule for commercial mounting, which keeps the top of a unit of this size no higher than 5 feet, is a sensible ceiling at home too.

7. Teach PASS, and teach when not to use it. Do it with the pin in. Never discharge a working extinguisher to demonstrate, inside or out; it empties a nonrechargeable unit, fills the room with powder that is mildly corrosive to electronics, and turns a teaching moment into a replacement.

Teaching PASS in the customer's kitchen

Hand them the extinguisher and walk them through it, standing where they would stand.

• Pull the pin, twisting it to break the tamper seal. Show the motion without completing it.
• Aim low, at the base of the fire, not at the flames. The flames are where the fire is visible; the base is where the fuel is.
• Squeeze the handle slowly and evenly.
• Sweep side to side across the base until the fire is out, then back away and watch it, because a fire can rekindle.

Then the part that matters more: the conditions under which they should use it at all. Use it only if the fire is small and contained, about the size of a wastebasket, the room is not filling with smoke, everyone else is already leaving, someone is calling 911 or is about to, and they are standing between the fire and a clear exit. If any of those fails, they leave, close the door behind them and call from outside. A 5 lb home unit discharges for seconds, not minutes; the label gives its discharge time and range, and it is worth reading aloud.

Pan fires are their own case. For a fire in a pan on the stove, the first move is to turn off the heat and slide a lid or a flat baking sheet over it, and leave it covered. Never water. A dry chemical stream aimed too close can scatter burning oil. Commercial deep fryers use a separate Class K agent for that reason; a home with a countertop fryer has the same problem in miniature.

When a multipurpose ABC unit fits a home. It covers the fires a house actually has: ordinary combustibles anywhere, flammable liquids in the garage, energized electrical equipment from a space heater to a dryer. One unit that handles all three is better than a cabinet of specialized ones nobody can tell apart in a hurry. Its cost is cleanup: the powder gets everywhere and should be vacuumed and wiped up promptly, especially from electronics. The common guidance is at least one on each level of the house and one in the kitchen and garage, which is a reasonable starting point to tune to the house.

Worked example: two extinguishers, two different failures

An HVAC tech on a fall maintenance visit offers to check the extinguishers. There are two.

The kitchen unit is the one on the label above. Gauge: green. Pin and seal: intact. Body and hose: clean. Manufacture stamp: 13, so 2013. It is 2026, and 2026 minus 2013 is 13 years, one past the 12-year line for a nonrechargeable unit. It also hangs on the side of the cabinet directly beside the range, about two feet from the nearest burner. So it passes its gauge and fails its age, and its location puts the fire between the customer and the handle. Every reading on it except the date and the hanger looks fine, which is exactly why it has stayed in service.

The garage unit is a 10 lb rechargeable ABC unit with a metal valve head and a service tag from a local company dated 2020. Gauge: green. But the pin is missing and the seal is gone; the customer remembers "testing it" on a leaf fire two summers ago. The gauge reading cannot make up for that. A unit that has been discharged at all goes to the service company for recharge and inspection before it is trusted again.

The note to the customer:

• Kitchen extinguisher: pressure gauge is in the green, but it was made in 2013 and is a disposable unit; replace it. Mount the new one near the kitchen doorway, not beside the range.
• Garage extinguisher: pin missing and seal broken after an earlier use. Have it recharged and inspected by an extinguisher service company before relying on it.
• PASS and the small-fire rule were reviewed with the homeowner, without discharging anything.

What would have changed the call. If the kitchen unit's stamp had read 17, it would be 9 years old and in service, and the only finding would be its location. If the garage unit's pin had been in place with its seal intact, its green gauge and 2020 service tag would leave it in service until the service company's next date. If either gauge had been left of green, that alone would have taken it out of service, whatever the date.

How you know you checked it right

• Every extinguisher in the house is on your list with a gauge reading, a pin-and-seal state, a manufacture year and a location.
• The age arithmetic is written out, not estimated.
• Nothing was discharged, refilled or opened.
• The customer has handled the unit, can say the four PASS words, and can say when they would leave instead.

References

• NFPA 10, Standard for Portable Fire Extinguishers, in the edition adopted where it applies (12-year limit on nonrechargeable dry chemical units; mounting height)
• Extinguisher manufacturer manuals (rating, discharge time and range, owner maintenance)
• See related: What a Fire Extinguisher Rating Actually Means
• See related: Fire Extinguisher Placement and the Monthly Tag