Fans are less efficient, and there are no proven benefits from this technique. Provides high and low ventilation rates when used in conjunction with a 2-speed fan motor. The thermostat provides automatic switching between high and low speeds depending on room temperature. Used with variable speed fan motor to provide infinite variation in air delivery within the capacity of the fan. Used to best advantage in units where requirements are varying due to fluctuations in outside temperature or animal growth.
Air inlets The air inlet is the most important part of the ventilation system.
It provides both control and distribution of fresh air entering the building. Poorly designed or maintained inlets are the number one cause of ventilation system failure. The most popular type of inlet for exhaust ventilation systems is the adjustable slot inlet. It consists of a continuous slot area open to a source of fresh air with some type of adjustable board or baffle to control its width. Slots are usually located along the long dimension of the building at the junction of the wall and ceiling.