The two types n halon 1211 liquid streaming agent

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The two Types n Halon 1211 – liquid streaming agent used in portable extinguishers n Halon 1301 – gaseous agent used in fixed total flooding n Not harmful to equipment n Mixes thoroughly with air n Spreads extremely fast n Problems: n Can not be breathed safely in concentrations greater than 10% n Fires greater than 900° F it degrades to toxic chemicals Hydrogen Fluoride, Hydrogen Bromide and Bromine n Must allow adequate time to evacuate or cancel n Ozone depleting due to use of CFCs. Very high ozone depleting potential n No new Halon 1301 installations allowed n Existing encouraged to replace n Federal law prohibits production of Halon n Halon 1211 is being replaced n Halon 1301 is being banked for future use Common EPA replacements: n FM-200 n CEA-410 n NAF-S-III n FE-13 n Argon
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n Inergen n Low Pressure Water Mists Contamination and Damage n Smoke n Water n Heat n Suppression Medium Temperature Damage Points n Computer Hardware - 175° F n Magnetic Storage - 100° F n Paper Products - 350° F Heating Ventilation and Air Conditioning n Designate who is responsible n Clear escalation step in case of problems Physical Technical Controls Physical site security n Guards n Dogs n Fencing n Lighting n Locks n CCTV Guards n Can make judgments and adjust to rapidly changing conditions n Provide deterrent capability n Response and control n Reception and escort n Especially useful in personnel safety issues n Drawbacks: n Availability – human intervention n Reliability – pre-employment screening not foolproof n Training – subject to social engineering, not always up to date n Cost – expensive Dogs n Loyal and reliable n Keen senses n Especially useful in Perimeter control n Drawbacks: n Cost – expensive n Insurance – liability Fencing n Primary means of boundary control Height Protection 3’ to 4’ (1 meter) Deters casual trespasser 6’ to 7’ (2 meters) Too hard to climb easily 8’ with 3 strands of barbed wire (2.4 meters) Deters intruders
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Mantrap — physical access control routed though a set of double doors that may be monitored by a guard Lighting n Lighting types – floodlights, street lights, and searchlights n 8 feet high with 2 foot candle Locks n Two Types Preset and Programmable n Preset Locks – Typical Door Locks, must remove lock to change key n Programmable – Mechanical or electronic, dial combination lock Cipher lock - Keypad, numbers change randomly Closed Circuit Television n Visual surveillance n Record for analysis n Photographic or Electronic n Monitoring - preventative control n Recording - detective control Facility Access Control Devices n Security Access Cards n Two Types: n Photo image – dumb n Digitally Encoded – smart Photo Image Cards n Simple ID cards n Require decision by guards Digitally Encoded Cards n Contain chips or magnetic stripes n Card reader makes decisions as to access n Can provide logging of activity n Multi level access groupings n Smart Card - ATM Card may require PIN n Smart Card may be coupled with a token Wireless Proximity Readers n
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  • Fall '12
  • Hurst
  • Alarm Systems, Halon, physical access control, Radio Frequency Interference

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