Yearly
Yes, a fire extinguisher can be refilled by a professional service to ensure it is ready for use in case of a fire.
Every year
Where ever you purchased your extinguisher from you should be able to return to them to get it refilled. If they do not do refilling they can direct you to the proper place.
The cost to refill a fire extinguisher typically ranges from 15 to 50, depending on the type and size of the extinguisher. It is recommended to have fire extinguishers refilled annually to ensure they are in proper working condition.
The cost to refill a fire extinguisher typically ranges from 15 to 50, depending on the size and type of extinguisher. It is recommended to have fire extinguishers refilled or serviced annually to ensure they are in proper working condition.
It depends upon what type of extinguisher it is. Many refillable types must be internally inspected on one-year intervals. Others only after 3, 5 or 6 years. NFPA 1 13.6.9 prescribes timetables for inspection, maintenance and recharging of portable fire extinguishers, for reference, although it is not universally adopted.
Fire extinguisher
Commercially speaking, in the UK they have to be checked annually, and signed.
Flammable metals often require special chemicals to extinguish, assuming there are any. So, in fact, you WOULD use a "chemical extinguisher", but probably not an ordinary dry chemical extinguisher.
A Class C fire extinguisher should be used for electrical fires.
the base of the fire
A Class A fire extinguisher should be used specifically for wood fires.