Fire doors are divided into normally open fire doors and normally closed fire doors. Normally closed fire doors can effectively prevent the invasion of smoke and fire after a fire, so they are one of the important measures for fire protection. If the normally closed fire door is open, once a fire occurs, it cannot prevent the spread of fire and prevent the spread of smoke.

ZHTdoors Brandschutztüren, 31 Jahre Produktionserfahrung in Brandschutztüren und Fenstern. Die wichtigsten UL-Brandschutztüren, EN-Brandschutztüren, BS EN-Brandschutztüren usw. Wir haben eine Zertifizierung. ZHTdoors unterstützen OEM und freies Design. Unsere Vorteile: gute Qualität, Neupreis, guter Service.