4-3. CBR filters.
a. CBR filters are required in hardened structures to exclude DBR agents and particles from the
-
the
conditioned spaces. The portion of outside air to be filtered at all times through CBR filters depends
requirements of the occupied areas that must be protected within the facility. This protection must be
continuous and no CBR filter bypass will be allowed.
b. For installation in a permanent -type structure having air-conditioning or a simple recirculation
system, specific filters will be procured instead of complete filter units with motor blowers to permit a more
flexible and uniform design of the air-handling equipment, particularly when multiple filter units are
required. Table 2-4 and 2-5 and figures 4-1, 4-2, and 4-3 describe these filters and their assembly in a
typical package. The FFU-17/E, C22R1, or C32R1 gas filters and the M20 particulate filter are
recommended. These sizes can be handled more easily by maintenance personnel.
c. Extra care must be taken to ensure good sealing of leaks at the entrance and exit ends of the filter.
Special maintenance and testing requirement will be as required by AMCCOM.
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