Division 2 Compartments where animals are to be transported shall be equipped with a forced ventilation system which gives sufficient capacity to change the air in its entire volume as follows:

40 air changes per hour if the compartment is fully enclosed and the clear height is less or equal to 2,30 meters;

30 air changes per hour if the compartment is fully enclosed and the clear height is more than 2,30 meters;

75 % of the above relevant capacity if the compartment is partially enclosed.