General care and loading air conditioning units must be used during the loading operation and also be connected to the aircraft immediately after it arrives on stand at transit and destination stations. Where air conditioners are not available, all doors must be opened. Strong polyethylene sheeting to be placed between aircraft pallet and containers. The sheeting must extend approximately 25 cm (10 in) up the sides of the container, endeavoring not to occlude the ventilation openings. Adequate ventilation must be provided. This may require the use of additional fans. It is desirable that temperatures do not exceed 28˚C (82.4˚F). Pigs require good ventilation and in order to ensure air can move through the crate, special attention must be paid to aircraft’s ventilation pattern and ventilation pattern and capacity to remove heat.