Fire door page according to the thin thickness can be divided into a, B, C and D three specifications, the higher the specification, fire door noise reduction, heat insulation actual effect is stronger.

https://ztfiredoor.com/13433.html

AS fire rated door lite,vision panel fire doors,apartment fire rated door,fire prevent door,fire resistence syeel door,ul fire wood door,fire door sricker,apartment fire rated door,fire doors rated 30×80,AS fire rated door lite,certificate automatic fire door,fire resistence syeel door,commercial fire doors,stainless fire door,AS fire rated door lite,magnet fire door,fire resistence syeel door,apartment fire rated door