A method for preventing snow from melting and for packing a snow cover in an artificial ski facility, by injecting dry air or low-temperature air to permeate through a snow cover of an artificial ski facility. The entirety of the snow cover can be effectively cooled to reliably prevent snow from melting...http://www.google.se/patents/US6176091?utm_source=gb-gplus-sharePatent US6176091 - Method and apparatus for preventing snow from melting and for packing snow in artificial ski facility
