Negative pressure ventilators are used to enhance the ventilation of the building’s attic space. The ventilator is suitable for 14 degree roof slope and is attached using K-36 Sealing Adhesive and secured with roofing nails. The adhesive layer should be 0.5–1 mm thick, and the membrane should be pressed firmly against the flange of the penetration piece so that a bead of adhesive forms along the edge of the membrane.