As the country's requirements for building energy conservation become increasingly strict, passive houses have emerged. The passive doors developed by Kingfire are specifically designed for passive houses. Their thermal insulation coefficient K value can reach up to 1.0, the air tightness can reach level 8, and they also have Class B fire resistance function. The passive doors produced by Kingfire effectively solve the problem of door thickness. The minimum thickness of the door can be as low as 70mm, thereby making the performance of the passive doors even stronger.
