ProVent ventilates the subfloor due to the protected MicropumpingTM ventilation system. A forced ventilation of the underfloor area is the main advantage of ProVent underlay which makes it a unique product.The profiled underneath surface forms the system of air channels which, when walking on floor, ensures the air exchange that eliminates water vapour from the underfloor area. Thanks to the flexibility of polyethylene foam and the right size of air channels the walking on the floor creates pumping movements with enough pressure to exchange air in the underfloor continuously. ProVent is 3.5mm thick at the highest point (at waves) when extruded and approximately 3mm thick in working conditions under the floor pressure. The thickness together with the profile of air channels and the properties of foam are just correct to enable the continuous pumping. Underfloor ventilation feature improves considerably the level of protection that ProVent provides for the flooring material. The permanent air exchange on the surface of subfloor would keep the moisture level very low and prevent the formation of mould in the underfloor area.