Quantcast Figure 45. High Security Can Be Provided by Vent Frame Hardening as Shown

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MIL-HDBK-1013/1A
multiple small ports in the penthouse structure hardened by multiple grills
(see Table 34) might be considered.
4)
Filter Banks.  The discussion above regarding roof-mounted
equipment applies in general to filter banks, except that the banks
themselves are unlikely to offer any significant penetration time.  A
hardened enclosure, with one of the vent or duct hardening techniques,
appears to be the best approach.
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