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NOTE: This is an unformatted excerpt from our online fire protection training library.

Notification Appliances

Helpful Hint

The most common type of fire alarm notification appliances is a bell, horn or some other type of audible appliance. The key to successful notification of building occupants is to assure the appliances are located in a manner that allows everyone to hear the fire alarm signal. A common mistake is to place a few very loud appliances in the corridors and hallways and hope enough sound penetrates the walls and doors to alert the building occupants. When there are complaints that the fire alarm signal cannot be heard the power output of the appliance is usually increased. However, in most cases, doubling the output power of a horn or speaker will only increase the sound pressure level in the space by 3 to 5 percent. A much more efficient design, and often more economical as well, is to use a larger number of lower power appliances and place at least one in each occupied space.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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