Often the only cooling source in a manufacturing plant or warehouse was a ceiling fan, with a yellow ribbon tied to the blade so that people could see that it was really going around.

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The firm has extended its data warehouse with a distributed file source, he added.

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The Health Protection Agency (HPA) report said a hot tub on show at JTF Warehouse in Stoke-on-Trent was the probable source of an outbreak in 2012.

BBC: JTF Warehouse