UFC 4-021-02NF
27 September 2006
change 1, 23 October 2006
Figure 5-5. Sample Roof Hatch Configuration
5-3.2.2 Glass Break. Glass break sensors are a good intrusion detection device for
buildings with a lot of glass (windows, doors with glass panes). Glass as an exterior
protection barrier is easily defeated. Windows can be quickly and easily broken.
Consider the case of installing a card reader on an administrative exterior door. The
determined intruder will not let the door lock deter the intrusion effort, but can take the
option of breaking nearby accessible windows.
5-3.2.2.1 There are three basic types of glass-break sensors: acoustic sensors (listens
(feels the shock wave when glass is broken), and dual-technology sensors (senses
acoustic and shock vibrations). Glass-break sensors should be used in conjunction with
other methods (such as volumetric sensors) because they do not sense motion or
intrusion from entering a door or hatch.
5-3.2.2.2 Glass break sensors can be used to cover several windows.
5-3.2.3 Glass Types. There are a variety of glass types: plate, tempered, laminated,
and wired. For inhabited facilities, UFC 4-010-01 requires laminated glass for windows.
Most glass break sensors work with all glass types to include laminated glass.
5-3.2.4
Glass Break Sensor Guidance:
5-3.2.4.1 Do not use window mounted glass break sensors.
5-3.2.4.2 Glass break sensors should only be used in protected areas with windows on
the ground floor or that are easily accessible.
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