The sirens are designed and intended to be outdoor warning devices ONLY and their sound may not penetrate a structure because of the distance from the siren; background noise levels within the structure; and other factors such as wind speed and direction, obstruction (trees and buildings) present in the sound path, and changes in terrain. The planning range for the effectiveness of the warning signals at a normal 70 decibels for the residential area is approximately 5,120 feet.
The sirens are designed and intended to be outdoor warning devices ONLY.
