Profile: W. B. Marvin Manufacturing Co. offers fans, screens and heaters. Our heaters include advanced heaters, standard heaters, heavy-duty heaters and replacement heating elements. We produce 14" high velocity fan, which features powerful 3-speed, 100-watt motor, precision balanced aluminum fan blades, storage wrap and carry handles. We supply 7" high window vent weather resistant, which includes painted metal rails and varnished wood & coated screens.