Patent ID: 8662378

Claim:
A ventilation board made of multi-layer material, wherein the board comprises: a layer provided with a first aperture; an adjacent layer, made of either a corrugated surface or a corrugated surface with a laminar surface, provided with a second aperture, wherein atleast one of the first aperture and the second aperture has a lateral dimension greater than the width of a corrugation of the corrugation surface; and the first aperture and the second aperture being located relative to each other such that the first aperture and the second aperture are vertically not aligned with each other and are substantially without overlap whereby the second aperture is substantially covered by the layer provided with the first aperture; atleast one ventilation passageway interconnecting the first aperture and the second aperture to provide ventilation from one of the sides of the board to the other side of the board thereby permitting the passage of fluid therebetween and through the ventilation board; and a plurality of insulating passageways connecting with either one of the first aperture and the second aperture for providing insulation by permitting passage of fluid into and along the insulating passageways.