building  has  become  the  standard  warehouse.  The location  of  office  space  in  this  type  of  warehouse  may be within the building or outside of the warehouse. In either case, the location of the office space is on the same side of the warehouse as the truck docks. Normally, two main aisles run the length of the warehouse. This is to allow material handling equip mentor supplies to move straight through the length of the warehouse. Typically, cross aisles connect the main aisles.  The  functions  found  in  the  general-purpose warehouse include retail issues, bulk storage, receiving, shipping,  preservation,  security  areas,  and  admin- istrative  offices. The refrigerated warehouse outwardly resembles a general-purpose  warehouse,  although  it  is  usually smaller. This warehouse is usually in two separate parts. One part is a chill space with controlled temperatures between 36°F and 46°F. The other part is a freeze space that  allows  control  of  the  temperature  below  32°F. Because  the  chill  and  freeze  spaces  divide  the refrigerated warehouse, there are no main aisles that run the length of the entire warehouse. The  flammable  storage  warehouse  is  built  of noncombustible  material  and  has  fire  walls  with  a 4-hour  fire-resistance  rating.  The  main  source  of protecton comes from an alarm and automatic sprinkler system. Sheds are buildings without complete sides and end walls. The Navy uses sheds for storing materials that require maximum ventilation or materials that do not require  complete  protection  from  the  weather. OPEN STORAGE SPACES.— The  open  storage spaces are improved or unimproved open areas used for storage  purposes. The  open  improved  storage  spaces  include  graded spaces or areas and areas surfaced with concrete, tar or asphalt, gravel, or other suitable topping. The Navy uses these spaces for storing certain materials invulnerable to damage by adverse weather conditions. Open unimproved storage spaces are unsurfaced open  areas  used  for  storage.  The  significant  dis- advantage of this type storage is the limitation on the use of  material  handling  equipment. Types of Storage Facilities Afloat There are several types of storerooms afloat. In most ships, the general stores (S-1) and aviation stores (S-6) divisions use the same spaces to store material common to  both.  Storage  locations  of  material  specifically  used by the ship are in spaces assigned to the S-1 division. Aviation items are stored in spaces assigned to the S-6 division. The main issue storeroom is the space set by the supply  officer  as  the  central  distribution  point  for  the general stores division. Generally, this space is the most accessible of all stock stowage spaces when watertight integrity  restrictions  are  in  effect.  This  storeroom contains a locator system either in manual or automated format. All receipt and expenditure documents normally channels  through  the  main  issue  storeroom. The bulk storerooms are spaces used for storing wholesale quantities of small items and heavy and bulky material. The repair parts storerooms are spaces used for stowage of all repair parts. The only exceptions are those bulkhead-mounted spares and material authorized for stowage  in  other  departments.  Repair  parts  storerooms contain stowage aids, such as bins, drawers, shelves, racks,  and  cabinets  used  for  stowing  material.  Material needed to support aviation maintenance is stored in the maintenance  support  package  (MSP)  storeroom  under the  S-6  division.  Aviation  repairable  parts  are  stored  in separate  storerooms  in  the  S-6  division. The flammable liquid storeroom can beat either end of the ship, below the full load waterline. This space must be as far away as possible from the magazines. This storeroom must have automatic fire alarm and fire- extinguishing  equipment  (CO2 or  HALON  system). Also, this storeroom should have incandescent and explosionproof  overhead  lights  (protected  by  lamp guards)  with  the  switch  outside  the  compartment. Flammable  items  stored  in  this  storeroom  have  an assigned material content code (MCC) of D, F, G, P, S, and  Z  in  the  Hazardous  Material  Information  System (HMIS). Refer to the HMIS and NAVSUP-P485 for information   concerning   handling   of   hazardous materials. TEMPORARY STORAGE OF SHIPBOARD MATERIAL BY SHORE ACTIVITIES When  necessary,  ships  may  use  shore  facilities  to store material temporarily. Temporary storage of allow- ance list items of equipage or equipment over 1 year must  have  prior  approval  by  the  type  commander. Consumable materials, tools, and other items required to  support  ship’s  equipage  and  equipment  will  not  be offloaded  for  temporary  storage.  However,  some  items may  be  offloaded  as  authorized  during  shipyard, overhaul, conversion, or change of mission. The ship requesting  storage  is  responsible  for  arranging  the offload  and  return  of  material.  The  requesting  ship  is also responsible for informing the storage activity of any change in the length of storage. 6-3