The humidified blended oxygen is then circulated through corrugated tubing. In cold climates, humidified air may require insulated and/or heated air hoses. Treatment consists of humidified oxygen, bronchodilators, suction, endotracheal tube and chest physiotherapy. The cold air is warmed by the water and is humidified by evaporation. Supplemental oxygen can be given and it may be warmed and humidified. Air is warmed to , humidified and cleansed by the conducting zone. A flow-olfactometer produces a constant heated and humidified flow of pure air. For example, the original documents of the U.S. Constitution are stored under humidified argon. As of 2017 heated and humidified air, such as via RhinoTherm, is of unclear benefit. Layer 3 has even stronger humidified sand, as well as gypsum concretions. The gas was humidified and the pressure increased to get better mileage. Properly humidified feathers flex during play, enhancing the shuttle's speed change and durability.