Abstract: An improved ventilator apparatus for venting objectionable odors from a structure, while, at the same time, circulating fresh air through the structure, the ventilator apparatus comprising a vent conduit secured to the structure such that one end portion of the vent conduit is disposed within a lower interior portion of the structure and the opposite end portion extends from the structure and thus establishes fluid communication between the lower interior portion of the structure and the atmosphere, a housing encompassing a portion of the vent conduit, one end portion of the housing being disposed within the structure, the housing having two passageways therein for establishing fluid communication through the housing between an upper interior portion of the structure and the atmosphere, a terminal housing having an inlet and outlet, the terminal housing being rotatably mounted on the vent conduit and the housing such that the inlet of the terminal housing communicates with one of the passageways in the housin