R-Vent® is a 40% recycled ventilation mat used in cedar, metal, & tile roof construction. The 90% open mesh creates an airspace/cavity that is perfect for promoting air flow in all directions
CrossVent RB will enhance durability of the roof system - TechnicalTextile.net
Metal roof ventilation with EnkaMat ASV | Enka Solutions
CedAir-Mat ® Roof Ventilation Mat – advancedbuildingproductsshop.com