4.1 In Class INF 1, 2 and 3 ships:
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.1 adequate ventilation or refrigeration of enclosed
cargo spaces shall be provided so that the average ambient temperature
within such spaces does not exceed 55°C at any time;
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.2 ventilation or refrigeration systems serving
cargo spaces intended for the transport of INF cargo shall be independent
of those serving other spaces; and
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.3 those items essential to operation, such as
fans, compressors, heat exchangers, cooling water supply, shall be
provided in duplicate for each cargo space and spare parts shall be
available, to the satisfaction of the Administration.