The object of ventilation is to provide fresh air to the horse, which is achieved by providing sufficient openings in the building so that fresh air can enter and stale air can escape. In hot weather, ventilation is need to remove heat from the stable. Whereas, in winter, the purpose of ventilation changes from reducing heat to controlling moisture, ammonia and stench that have built up in the more closed environment of the stable. 

Ventilation is primarily driven by wind forces, so good ventilation is achieved by allowing wind to bring fresh air into the building , while drawing stale air out.

A permenant opening to both eaves that allows air to enter air entry into each stall will provide fresh air to each horse. 

One of the ways we achieve maximum ventilation in our stables is by buiding in a timber vent to the gable end truss.