The energy industry is comprised of those industries involved in the production and sale of energy, including petroleum, natural gas, electrical power, coal, nuclear and renewable energy. The electrical power industry, particularly electricity generation maintains facilities requiring best ventilation practices. Generating stations or powerhouses require large amounts of turnover ventilation air to maintain ambient temperatures within facilities. Successful results are formulated with multiple rooftop and wall mounted supply and exhaust fans along with custom air handlers. Careful selection is required as excessive noise levels directed onto adjacent properties can be a sensitive issue.