Alipai negative pressure air vents ventilate the roof structures and ensures efficient removal of moisture. Moisture is accumulated in wood, concrete and other building materials during the building phase. Moisture can also derive from leaks in structures.

Did you know that if the roof is not ventilated properly, moist air that arises from the building to the roof can condense and cause moisture in the thermal insulation of the roof? During winter, this moisture can freeze and the thermal insulation loses its insulating properties, which in turn can result in a significant rise in heating costs. Excessive moisture promotes the growth of fungi, moulds and microorganisms, damaging the structures of the house. With Alipai vents, the thermal insulation of the roof remains dry, the indoor air quality is improved and the heating costs become lower.

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