Photos: Big Blue shows its green side 
Published: 29 May 2007 17:29 BST
From the outer room, the data centre itself, where the main processing takes place, can only be viewed through the smoked glass in this door. The door is air sealed and is quite tough to open against the pressure between the two rooms.
The inner room is the cold room and all the air conditioning is angled towards keeping the inner room as cold as possible. The excess heat from the servers is dissipated first to the outer room and then to the outside environment. The aim of using an inner room for the main cooling area is to minimise the area that the air conditioners have to work to cool down.
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