prevents possible to adjust the length freely combined and outdoor air and indoor air to be mixed so , with the secondary connector is connected with ventilation, installed outside the walls of buildings , and the intake and exhaust vents are formed and divided into two parts with the outside of the upper and lower portions being connected with the inlet and outlet that connects the inner , outer air vents and connecting the auxiliary connector , and a plurality are connected with the large diameter is made small diameter portion is inserted in one of the small-diameter portion and one of the large diameter body connection compartment is installed to the inner compartment into two equal parts in the longitudinal direction is determined depending on the building wall thickness provide for ventilation of the ventilation connection structure comprising a connector .
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