The 54-year-old, who does not want to be named, injured his spine and was unable to work for several weeks as a result of the incident in Woking on 17 December 2012 at a new-build head office for the World Wildlife Fund.
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He was working for Wilden Services Limited, of Hemel Hempstead, which had been sub-contracted to install a ventilation system in the new building.
Guildford Crown Court heard that the large fan unit, weighing some 630kg, fell over as it was being moved on a pallet truck and pinned him underneath.
The incident was investigated by the Health and Safety Executive (HSE), which found it could have been prevented had a better system of work been in place.
Wilden Services Ltd, of Belswains Lane, Hemel Hempstead, was fined £15,000 and ordered to pay a further £7,148 in costs after pleading guilty at an earlier hearing to a breach of the Health and Safety at Work etc Act 1974.
(CD/JP)
