Each vessel has different ventilation systems. There are large numbers of supply and exhaust fans taking fresh air in and then removing it to ensure a constant circulation. Each fan is fitted with an alarm system which can be reacted to in real-time by engineers and electricians on board. Vessels are also fitted with additional fans as part of their contingency planning.
Ventilation systems on livestock vessels are now independently verified and this report is sent to the Australian Federal Government. The Pen Air Turnover (PAT) is verified and these figures are used in the Heat Stress Model when planning the voyage.