Damage caused by moisture can be avoided by using the right method to ventilate the insulation and the right build up of the roof construction. The Alipai low pressure air vent is an essential part of such structures. Alipai ventilates the roof structures and removes moisture efficiently. The functioning of the Alipai low pressure air vent is based on the differential air pressure generated by airflows, i.e. wind or temperature.
Ridge Alipai 27° low pressure air vents is for the ridge of the felt roof. The pipe size, Ø75, 110 or 160 mm, is selected on the basis of the need for ventilation. The Ridge Alipai 27° is made of polymer, a noncorroding material. The standard colour is black.