I cannot actually answer your question: I'd probably call back and if they still don't, I'd ask what to do. What I can give you is the next best thing: A way t

I cannot actually answer your question: I'd probably call back and if they still don't, I'd ask what to do. What I can give you is the next best thing: A way to self-check. Most fire extinguishers have both an expiration date and a pressure gauge. You want the pressure to be in the green and the date to be in the future. They usually last 10-12 years with proper care, but you still want to regularly check these things. My source for this: An inspector, who checked the extinguishers for the pharmacy I worked at back then (was employed or contracted by the pharmacy chain). It has been over 10 years, but it doesn't look like this information is out of date.