Just had our fire extinguisher tech in to do the annual check and recharge. It cost us all of $120.00 for six extinguishers; that's cheap insurance. Six units seems a bit much for a 2600 square foot office (though one of those six is a spare), but my restored 1914 building is partially wood frame, and the wood has had lots of time to dry out. So I'm paranoid; but am I paranoid enough?
We realized some years back that some of our customers (we are a Phoenix commercial cleaning service) were neglecting the OSHA required annual inspection by a certified tech; what surprised us was that well over 90% skipped the also mandated monthly visual inspection. The monthly inspection can be done by anyone; it's just a matter of checking that the charge arrow is in the green field, the lock-out ring is in place, and the extinguisher is sitting where it's supposed to be. Then you date and initial the back of the card (that's what the dozen little boxes are for, on the tag that the tech puts on when he does the annual). Might take 20 seconds, on a slow day.
While I admit to occasionally tweaking OSHA's collective nose on their occasional over-the-top regulation, the fire extinguisher regs make pretty good sense. You want to have an extinguisher reasonably close at hand to everyone in the office and, if you do have an extinguisher, it rather makes sense to look at it regularly to see if it is likely to work when called upon. So I am pretty religious about the annual tech visit, and the monthly visual. It's on my calendar and everything.
But we go a bit further. When we noticed that our clients were neglecting their fire extinguishers, we added the monthly visual inspection, date and initial to our no additional cost monthly safety inspection. (We check exterior security lighting, batteries on interior "Exit" signs, the janitor closet for unlabeled, uncapped or other inappropriate chemicals and for clutter, and so on.) Because our office cleaning Phoenix operation consists primarily of "route work", we serve quite a lot of firms too small to have a dedicated safety officer (or even a not very dedicated one...). So someone has to do it. And, being in janitorial Phoenix, we tend to be at the bottom of the food chain.