Newhb UL standard fire shutter door needs to be burning tested at high temperature for 180 minutes, and then impact the door body with a 310 kPa high-pressure water gun for 5 minutes to ensure that the door body will not be penetrate or deformed. Newhb door industry has passed the American standard test, with complete qualifications and reliable quality, and is exported to the United States and related countries and regions that recognize UL standards.
