They are hard wired to my electrical system, but they keep beeping like the batteries are dead
Here's the story. 250 years ago, fire hydrants were installed in London. A dog just hapened to pee on it. Thousands of dogs have peed over the previous dogs pee. The dogs exchanged notes and voted hydrants as the best place to pee. Yes, that's how it started. -MM
Class A extinguishers will put out fires in ordinary combustibles, such as wood and paper. Class B extinguishers should be used on fires involving flammable liquids, such as grease, gasoline, oil, etc. Class C extinguishers are suitable for use on electrically energized fires. The presence of the letter “C” indicates that the extinguishing agent is non-conductive. Class D Extinguishers are designed for use on flammable metals and are often specific for the type of metal in question. Dry Chemical extinguishers are usually rated for multiple purpose use. They contain an extinguishing agent and use a compressed, non-flammable gas as a propellant. Halon extinguishers contain a gas that interrupts the chemical reaction that takes place when fuels burn. These types of extinguishers are often used to protect valuable electrical equipment since them leave no residue to clean up. Halon extinguishers have a limited range, usually 4 to 6 feet. Carbon Dioxide (CO2) extinguishers are most effective on Class B and C (liquids and electrical) fires. Since the gas disperses quickly, these extinguishers are only effective from 3 to 8 feet. Many extinguishers available today can be used on different types of fires and will be labeled with more than one designator, e.g. A-B, B-C, or A-B-C.
