Days and other passage fire door fire doors north flow channel

By the doors, door frames, door pockets, special seals, special fittings of five components, its unique design, novel structure of science, quick installation, high strength and wear-resistant, non-toxic and tasteless, anti-corrosion moth, physical stability, but no nail holes, not cracking, noise insulation, moisture resistance and other characteristics, by the National Environment Commission certification, the "III environmental label certification", is a green product, quality management through international quality system certification. Favored by the users.