A roll film negative. On board the Tribal class type 81 frigate Mohawk (1962) in Portsmouth Dockyard. She was in a dry dock from 21 March to 11 April 1972 when she moved to the South Railway Jetty. In the fan compartment between 54 and 55½ stations on the centre line of 02 deck. The photographer is looking forward through the open doorway. On the right is a Keith fan manufactured by Keith Blackman Ltd of London. Two large fan units on the left are marked 02G14 and 02G16. A vertical format negative.