1, store location. 20 square store is located in a busy shopping district or busy streets, around the vehicle, pedestrian traffic is frequent, need to install air curtain machine, in order to avoid the loss of hot air, cold air, to maintain a stable indoor temperature.

2, climatic conditions. 20 square store location of the cold climate, or temperature changes, then the installation of air curtains can effectively reduce the difference between indoor and outdoor temperatures, reduce heating or cooling costs.