Division 3 The owner or keeper shall ensure that each house of a holding is equipped with ventilation and, if necessary, heating and cooling systems designed, constructed and operated in such a way that:

the concentration of ammonia (NH₃) does not exceed 20 ppm and the concentration of carbon dioxide (CO₂) does not exceed 3 000 ppm measured at the level of the chickens’ heads;

the inside temperature, when the outside temperature measured in the shade exceeds 30 °C, does not exceed this outside temperature by more than 3 °C;

the average relative humidity measured inside the house during 48 hours does not exceed 70 % when the outside temperature is below 10 °C.