Bases are constructed from structural steel channel iron, and are engineered to support the components within as well as the entire unit. A 1/4" steel grip guard plate is used for the flooring surface to eliminate any "oil canning" and create a non slip surface. The base is fully insulated with 2" urethane insulation. A 1.5" collar around the entire unit is provided to act as a auxiliary drain pan. Emergency drains are also provided and terminated at side of unit.