UL steel fireproof door is exquisite in workmanship and uses high-quality materials, thus improving the stability and scientific performance in the use process. UL steel fireproof door has a long service life and meets the long-term durability requirements in the actual use process.

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.