Combined intake and exhaust ventilator

Claim 1

A combined exhaust and intake ventilator apparatus capable of moving air both into and out of a space to be ventilated, comprising a parallelipedic casing having top, bottom and side walls and substantially parallel internal and external walls adapted to be positioned in a space to be ventilated and to be exposed to the atmosphere respectively, said internal wall having an air intake opening and an air discharge opening disposed side by side, said external wall having an air intake opening and an air discharge opening disposed side by side between said side walls, the air intake opening of said external wall facing the air discharge opening of said internal wall and the air discharge opening of said external wall facing the air intake opening of said internal wall, partition means in said casing dividing the same into first, second and third compartments, first and second air blowers located in the first compartment, each consisting of a housing and of a fan located in said housing, said housing having an air inlet and an air outlet, said first and second air blowers arranged with their air outlets oppositely disposed, the air outlet of said first blower facing said internal wall air discharge opening and the air outlet of said second blower facing said external wall air discharge opening, said first compartment in full communication with said internal wall air intake opening, with the air inlet of said second blower opening within said first compartment, said second compartment establishing communication between said internal wall air discharge opening and the air outlet of said first blower, said third compartment establishing communication between the air inlet of said first blower, the air outlet of said second blower and said external wall air intake and air discharge openings, said partition means including a first partition member disposed parallel to said external wall and spaced inwardly therefrom to define at least a portion of said third compartment therewith, said partition means including a second partition member perpendicular to said first partition member and joined with the latter, with said bottom wall and with said external wall and separating the external wall air intake opening from the external wall air discharge opening, said second partition member having a top edge terminating short of said top wall, so as to divide said third compartment only partially into two sub-compartments in full intercommunication above said top edge and an adjustable elongated flat damper having an inner longitudinal edge hinged alongside the top edge of both said external wall air openings, end edges close to said end walls, and an outer longitudinal edge parallel to said inner longitudinal edge, said damper being slotted for the free passage of said second partition member, said damper pivotable between a closed position closing both said external wall air openings and in which said outer longitudinal edge is spaced from said first partition member, whereby said damper opens the communication between said two subcompartments over said top edge, and an open position in which its outer longitudinal edge is spaced from said bottom wall to open said exterior wall openings and is close to said first partition member to close the communication between said two subcompartments.