Answer:
To make sure they remain effective.
Explanation:
A fire extinguisher is a portable device used to extinguish a fire.
Handheld extinguishers are pressurised with nitrogen or carbon dioxide and can be used in the kitchen or garage.
Fire extinguishers controls the amount of pollution caused by smoke and burning.
Although they have no expiring date, they won't last forever. Extinguishers should work for 5 to 15 years, but fire extinguishers be routinely maintained to make sure they remain effective.