Exhaust fan will provide natural ventilation to dairy farm, it provides fresh air, control moisture produced by the cows, and remove odours in the dairy farm. The natural ventilation system distributes fresh air evenly throughout the barn to prevent dead spots and avoid drafts in the winter, and remove heat in the summer.

Cow produce less milk in summer due to the hot weather, installing water cooling pads on one side of the walls, and installing the exhaust fans opposite to the cooling pads and building a natural ventilation and cooling system. The temperature will be lowered by 10℃ at least, which will help to increase milk production