All fire doors must be fitted with intumescent seals. They may be placed into grooves in the two vertical sections and top edge of the door frame. Intumescent strips are a fundamental part of fire doors. When exposed to heat they expand in size, sealing the gap between the fire door leaf and the door frame.
Most importantly, there must be an appropriately sized gap between the fire door and door frame. These gaps are determined by the manufacturer's instructions but are generally no larger than 3mm. If combined with a smoke seal, the gap at the bottom of the door may differ. However, in non-smoke conditions, the gap will generally be around 10mm.
The Building Regulations identify when and where intumescent strips are required. Different materials are used by different manufacturers and therefore activate at different temperatures. Combined intumescent and smoke seals can also be installed.
Located in a port city, China Dalian Golden House Door & Window Manufacture Co., Ltd. is a large-scale enterprise specialized in producing American-Standard steel fire doors and wooden fire doors. Our company produces 50000 sets of steel fire doors and 20000 sets of wooden fire doors every year. Our fire door products have passed UL Approvals AND FM Approvals and INTERTEK(WH) approval successively. Moreover, our fire door products can be sold directly to more than 20 countries over North America, Latin America, Middle East and Africa.
We respond to tendency of international fire doors market, and provide good service combining foreign clients' needs, with an aim of expanding a wider international market. In the future campaign for world market, our foreign trade elites will achieve better sale performance through unremitting efforts and dedication.
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