UL fire door standard is to conduct fire resistance test and subsequent water impact test for fire doors within a specified time (60min/90min). Generally, UL labels on products need to be applied for certification, and UL fireproof door labels can be affixed on products only after they meet the certification requirements.

Deriyên agir ZHTdoors, 31 sal ezmûna hilberînê di deriyê agir û pencereyan de. Deriyên agir ên sereke yên UL, deriyên agir EN, deriyên agir BS EN, hwd.. Em xwedî sertîfîkayê ne.