Top Trusted Aluminium Internal Fire Doors Manufacturer & Exporter

Under international standards such as BS EN 13501-2 and BS 476, Integrity (E) measures the ability of the door assembly to prevent the physical passage of flames, hot gases, and ignition sparks from the fire-exposed side to the non-fire-exposed side. However, radiant and conductive heat can still pass through uninsulated glass or aluminum frames. Insulation (EI) is a significantly more rigorous requirement: it mandates that the average temperature rise on the unexposed surface of the door leaf and frame does not exceed 140°C above ambient temperature (or 180°C at any individual spot). For escape corridors, stairwells, and areas where occupants may shelter, building codes typically mandate Class EI doors to prevent clothing or materials on the safe side from spontaneously combusting due to radiant thermal flux.

Yes. A primary market for our manufacturing output is North America. We routinely fabricate doorsets to exact fractional inch door schedules (e.g., 36" x 84", 48" x 96", 72" x 96" double egress units). Our design engineering team produces detailed submittal shop drawings following NFPA 80 (Standard for Fire Doors and Other Opening Protectives), ensuring full compliance with rough opening dimensions, door gap tolerances (1/8-inch perimeter gap), latch throw requirements, and positive-pressure testing under UL 10C.

While pure aluminum melts at roughly 660°C, fire-rated aluminum assemblies are composite systems rather than simple hollow profiles. The extruded aluminum profile functions as an external aesthetic casing and structural framework. The internal cavities of the aluminum profiles are completely filled with high-density inorganic, hydrated mineral compounds and proprietary ceramic fire cores. During a fire, these compounds undergo an endothermic reaction, releasing chemically bound water molecules that actively cool the internal chambers and delay aluminum melting. Furthermore, internal steel structural reinforcement sleeves are inserted to ensure structural anchoring to the wall substrate even after long exposure times.

Our multi-layer fire-resistant intumescent glass configurations naturally offer exceptional mass and acoustic damping characteristics. Depending on the fire rating and configuration specified, DERCHI fire-rated aluminum internal doors achieve acoustic attenuation performance ratings between STC 38 and STC 47 (Rw 37 dB to Rw 46 dB). For high-privacy applications like boardrooms, hospital patient wings, or multi-family entry doors, we combine specialized acoustic interlayers with automatic drop-down mechanical threshold seals that drop when the door closes to prevent sound flanking and smoke leakage beneath the leaf.

Standard production turnaround for bespoke custom fire door schedules is typically 25 to 35 business days following final CAD shop drawing sign-off and finish sample approval. For ocean export, all items are crated in fully enclosed, fumigated ISPM-15 compliant plywood cases lined with moisture-barrier film and dense edge-absorbing corner cushions. We coordinate complete FOB, CIF, or DDP shipping documentation—including commercial invoices, packing lists, bill of lading, and mill test certificates—directly with your designated freight forwarder or customs broker for hassle-free port clearance.