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.
Inclined Alipai is for inclined felt roof which roof angle can be up to 45 degree. The pipe size, Ø110 or 160 mm, is selected on the basis of the need for ventilation. Alipai is made of polymer, a noncorroding material.