Class A fireproof door can only reach 1.5h fire resistance time limit, and only the fireproof door made by special process can meet the 3-hour fire resistance requirement. The 3-hour fire door adopts the galvanized steel plate and stainless steel profile made by special process as the outer frame, which can be used as the window, but the window specification should not be too large.

ZHTdoors menyako ea mollo, lilemo tse 31 tsa boiphihlelo ba tlhahiso menyakong ea mollo le Windows. Menyako e ka sehloohong ea mollo oa UL, mamati a mollo oa EN, mamati a mollo a BS EN, joalo-joalo,.Re na le setifikeiti.ZHTdoors tšehetso OEM le mahala moralo.Melemo ea rona: boleng bo botle, theko ea fektheri, tšebeletso e ntle.Rea u amohela ho buisana le rona.