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Yes, fire extinguishers eventually expire. However, the good news is that a properly stored fire extinguisher can last a decade or longer. They don’t have an expiration date on the canister, but you can check the manufacturing date on the “UL” nameplate near the classification information. Maintenance will also give your fire extinguisher longevity. Check the gauge at the top of the extinguisher every month. You'll want to make sure the gauge needle is in the green section, and if a hose or nozzle has been used or damaged, you need to replace it.

A grease fire starts if hot cooking oil comes into contact with a heat source, such as an electric heating element or the flame on a gas range. Once the grease is ignited, it can be very difficult to put out. 

No. Removing the cause of concern will only lead to deeper concern. You cannot use any fire-powered appliance like a fireplace or furnace without an escape route for the smoke and fumes. If you remove the flue intending to repair or replace it, you should only use the fireplace, wood stove, or furnace once the flue is in working order. If you cannot replace the flue you have removed, call a chimney repair professional immediately.

Electrical fires are unique from other fire types because they have the potential to deliver electric shocks in addition to being on fire. Avoid serious injury from possible electrical emergency situations by avoiding the use of water, foam-based fire extinguishers, wet-chemical fire extinguishers,  flour, or baking powder to put out an electrical fire.