Fire Escape Mask requires the ambient temperature should be zero degrees Celsius to 40 degrees Celsius, with at hotels, restaurants, office buildings, shopping malls, schools, kindergartens, hospitals, theaters, restaurants, apartment buildings, residential buildings and other places, for a burst of fire escape equipment. Fire Equipment Co., Ltd., Xi'an Runchi operation of various fire equipment, Xi'an delivery, specific price negotiable, one year free service! ! Address: Chang'an Road, Xi'an Chang'an One Building 1-508 grassy slopes Tel :029 -85352221 Website http://www.xarunchi.com