The steel fireproof door has excellent sealing performance. It is tightly closed, and will not leave a crack in the door to make the cold air overflow. As long as the steel fire door is pushed open by hand, it will automatically close quietly, and will not produce a collision sound like the internal and external door opening, thus creating a quiet environment.

ZHTdoors防火门，31年防火门窗生产经验。 主营UL防火门、EN防火门、BS EN防火门等。我们有认证。ZHTdoors支持OEM和免费设计。我们的优势：质量好，出厂价，服务好。欢迎咨询。