This air inlet is suitable mostly for poultry. With a middle hinged inner valve the air will be divided and also flows underneath the valve when it is opened over 35%. The curved inner valve helps to guide air downwards to the animals during maximum ventilation. The valve and house of this inlet are equipped with seals all around to prevent air leakage. Curved inner corners in the house make for a better air flow. The combination of materials and air seals help to make this inlet perfectly suitable for use in extremely low temperatures.