No doubt, you’ve heard the piercing whine of a smoke detector’s alarm before. But just how loud are they? The answer is not as cut and dry as you might think. The National Fire Protection Association, which oversees such things, necessitates that smoke alarms sound at a minimum of 75 decibels. For comparison, this is roughly the same volume as a vacuum cleaner under normal operation. On average, however, most smoke alarms in the United States sound at approximately 85 decibels. This is roughly the same volume as a diesel truck passing by at 40 mph at a distance of approximately fifty feet.

The alarm on a smoke detector is loud for good reason. While its volume might be a nuisance from time to time or occasionally unnerving, smoke detectors are designed to warn you of real, serious danger. If you’re the kind of person that could sleep through World War III, you’ll be glad that your smoke detectors are as loud as they are in the event of a serious emergency within your home.

Crossfire’s state-of-the-art smoke detectors are made with 100 decibel semi-conductor driven piezo horns. 100 decibels is a volume that is sure to wake up even the deepest sleeper among us. But how loud is that? By comparison, that’s as loud as a jet would sound while taking off 300 meters in front of you. It’s also as loud as a jackhammer! Now, we know that might be loud, but trust us when we say that you’ll be glad it’s so loud if our smoke detectors ever go off while you’re sleeping.

(Source: http://www.ehow.com/facts_6067325_decibel-level-smoke-detector_.html)

(Source: https://www.chem.purdue.edu/chemsafety/Training/PPETrain/dblevels.htm)