A ventilator in a cover for a deck on a boat. A base of the ventilator has first openings therein through which the deck is connected to a chamber formed by the first intermediary member and the base. A motor retained in the first intermediary member has a fan that is located in the chamber to expel air from the deck to the surrounding environment by way of second openings therein and third openings in a second intermediary member. A projection in the first intermediary member receives a connector from a solar panel that is located in an end member. The end member is joined to the first intermediary member to align the second and third openings with the chamber and the connector with the motor such that the fan is activated when light is received by the solar panel and air is continually thereafter drawn from the deck.