Saving heat from servers

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http://serverfault.com – I'm making some changes to our datacenter and I remember seeing an old article about getting the heat from the server and using it to heat the office. Does anyone one knows where can I find supplies to make something like that. We have 15 servers and they generate a lot of heat, so that would be an interesting idea to send all that heat to the office duct so it could heat other rooms and remove the heat from the server room. (HowTos)