Barn design and layout are not dependent on any particular style of chimney ventilation. The use of power ventilation to create a negative pressure in which air is exhausted through fans mounted directly to the ceiling with tubes that go up and out of the roof of the barn. Air intake for this type of ventilation can be either wall inlets or ceiling inlets. In the wall inlet system, the air is brought in directly, whereas in the ceiling inlet system, the air is brought in via soffit eaves or a cool cell room via the attic of the barn. This setup consists of designated variable fans that are specifically for minimum ventilation, and then larger output fans for the various higher ventilation stages.