FBII XL-2T User Manual - page 25
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LIMITATIONS OF THIS ALARM SYSTEM
While this system is an advanced design security system, it does not offer
guaranteed protection against burglary, fire, or other emergency. Any alarm
system, whether commercial or residential, is subject to compromise or failure
to warn for a variety of reasons. For example:
Intruders may gain access through unprotected openings or have the technical
sophistication to bypass an alarm sensor or disconnect an alarm warning
device.
Intrusion detectors (e.g. passive infrared detectors), smoke detectors, and many
other sensing devices will not work without batteries, or if the batteries are not
put in properly. Devices powered solely by AC will not work if their AC power
supply is cut off for any reason, however briefly.
Signals sent by wireless transmitters may be blocked or reflected by metal
before they reach the alarm receiver. Even if the signal path has been recently
checked during a weekly test, blockage can occur if a metal object is moved into
the path.
A user may not be able to reach a panic or emergency button quickly enough.
While smoke detectors have played a key role in reducing residential fire deaths
in the United States, they may not activate or provide early warning for a
variety of reasons in as many as 35% of all fires according to data published by
the Federal Emergency Management Agency. Some of the reasons smoke
detectors used in conjunction with the System may not work are as follows:
Smoke detectors may not sense fires that start where smoke cannot reach the
detectors, such as in chimneys, in walls, or roofs, or on the other side of closed
doors. Smoke detectors also may not sense a fire on another level of a residence
or building. A second floor detector, for example, may not sense a first floor or
basement fire. Moreover, smoke detectors have sensing limitations. No smoke
detector can sense every kind of fire every time. In general, detectors may not
always warn about fires caused by carelessness and safety hazards like smoking
in bed, violent explosions, escaping gas, improper storage of flammable
materials, overloaded electrical circuits, children playing with matches, or
arson. Depending on the nature of the fire and/or the location of the smoke
detectors, the detector, even if it operates as anticipated, may not provide
sufficient warning to allow all occupants to escape in time to prevent injury or
death.
Passive Infrared Motion Detectors can only detect Intrusion within the designed
ranges as diagrammed in their Installation and Setup Guide. Passive Infrared
Detectors do not provide volumetric area protection. They do create multiple
beams of protection, and Intrusion can only be detected in unobstructed areas
covered by the beams. They cannot detect motion or intrusion that takes place
behind walls, ceilings, floors, closed doors, glass partitions, glass doors, or
windows. Mechanical tampering, masking, painting or spraying, of any