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In areas where the shelter design wind speed for tornados is 250 mph in accordance with Figure 304.2(1) of ICC 500, all Group E occupancies with an occupant load of 50 or more shall have a storm shelter constructed in accordance with ICC 500.
Exceptions:
  1. Group E day care facilities.
  2. Group E occupancies accessory to places of religious worship.
  3. Buildings meeting the requirements for shelter design in ICC 500.
423.5.1 Required Occupant Capacity
The required occupant capacity of the storm shelter shall include all of the buildings on the site and shall be the greater of the following:
  1. The total occupant load of the classrooms, vocational rooms and offices in the Group E occupancy.
  2. The occupant load of the largest indoor assembly space that is associated with the Group E occupancy.
    Exceptions:
    1. Where a new building is being added on an existing Group E site, and where the new building is not of sufficient size to accommodate the required occupant capacity of the storm shelter for all of the buildings on the site, the storm shelter shall at a minimum accommodate the required occupant capacity for the new building.
    2. Where approved by the building official, the required occupant capacity of the shelter shall be permitted to be reduced by the occupant capacity of any existing storm shelters on the site.
423.5.2 Location
Storm shelters shall be located within the buildings they serve or shall be located where the maximum distance of travel from not fewer than one exterior door of each building to a door of the shelter serving that building does not exceed 1,000 feet (305 m).

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