FEMA 453 Design Guidance for Shelters and Safe Rooms

Tape, plastic, and carbon dioxide detectors are not necessary in
the Class 1 Safe Room.
3.6 MainTaininG THe CBR SHeLTeR
Depending on the shelter type, the shelter may require more
maintenance. Shelters that have increasing levels of protection
from filters will require more frequent checks and will require
more funding to keep them operational.
3.6.1 Maintenance for a Class 3 Safe Room
The Class 3 Safe Room has no air filtration equipment and,
therefore, requires little or no routine maintenance. It has no
mechanical equipment unless there are dampers for isolating the
air conditioner (configured for fail-safe operation). Maintenance
requirements are limited to periodically checking supplies for
deterioration or loss: duct tape, plastic sheeting, radio spare batteries,
flashlight spare batteries, drinking water, and first aid kit.
3.6.2 Maintenance for a Class 2 Safe Room
The filter unit used in a Class 2 safe room is an indoor air quality
filter unit (see Figure 3-3) and, as such, it can be used routinely
to improve the air quality in the spaces in or around the designated
safe room. If this is done, a spare filter set, both adsorber
and HEPA filter, should be stored in a sealed bag in the safe
room along with instructions and any tools needed for changing
the filter quickly in an emergency. Other supplies to be checked
on a regular basis are the same as listed for the Class 3 Safe
Room above.
CBR ThReaT pRoTeCTion
3-