Cesco's model GVS ventilators are designed for efficient and weatherproof gravity intake, relief, or exhaust applications. The low contour design is inconspicuous and virtually unnoticeable from the ground. Because of Cesco's heavy duty structural framing design, the GVS is ideal for conditions where heavy snow loads and windy conditions exist. The GVS models are shipped fully assembled from the factory to insure the highest quality standards are maintained.