Table 5.

Commercial shelter categories [58].

Shelter Considerations	In-Ground	Single-Use	Multi-Use	Community
Expected capacity	1–100	1–10	1–100	100–1000
Level of Protection	Blast (medium)	Blast (low)	All	All
Location	Basement or sub-basement area without windows and semi-hardened walls and ceiling.	Interior space without windows and semi-hardened walls and ceiling.	Conference room, data center, bathroom, stairwell and elevator core.	School, church, mall and government building.
Special Considerations	Difficult to site; build in high water table and rocky areas.	Annual or semi-annual inspection and rotation of supplies.	Multiple areas in large buildings; plan to prevent overcrowding.	Plan for multi-lingual, elderly and special needs populations.