Double fire door

Double fire doors must adhere to specific fire-resistance ratings, typically ranging from 30, 60, 90, to 120 minutes (FD30 to FD120). It is essential to verify that the products comply with international standards such as UL 10C (US), BS 476-22 (UK), or EN 1634-1 (EU). Ensure the supplier provides valid test reports from accredited laboratories like Intertek or UL to guarantee the door can withstand high temperatures and prevent the spread of flames.

The door leaf should ideally be constructed with a galvanized steel skin (minimum 1.0mm thickness) or high-quality fire-rated timber. The internal core must consist of fireproof materials like perlite board, rock wool, or vermiculite. For the frame, ensure a minimum steel thickness of 1.5mm to prevent warping under heat. Additionally, the inclusion of intumescent seals is mandatory, as they expand during a fire to seal gaps and block smoke.

Double doors require a coordinator (door selector) to ensure the leaves close in the correct sequence, maintaining the fire seal. You must specify heavy-duty fire-rated hinges (at least 3-4 per leaf) and a multipoint locking system or panic exit bars if used in public corridors. All hardware must be CE or UL listed; using non-rated hardware will void the fire certification of the entire assembly.

If the design includes windows, the glass must be fire-rated wired glass or specialized ceramic glass that matches the fire rating of the door itself. The total area of the vision panel is often restricted by local building codes to maintain structural integrity. Ensure the glass is fitted with fire-resistant glazing gaskets to prevent the glass from falling out during thermal expansion.

Request the original PDF of the test reports and certificates, then verify the certificate number directly on the issuing body's website (e.g., the UL Online Certifications Directory). Be wary of suppliers who only provide 'factory certificates' without third-party validation. For high-volume orders, consider hiring a third-party inspector like SGS or TÜV to perform a factory audit and witness a random sample test.

Fire doors are heavy and prone to edge damage. Insist on reinforced wooden crate packaging rather than just cardboard. Ensure the supplier uses corner protectors and moisture-proof wrapping to prevent rust on steel components during sea freight. When calculating shipping costs, account for the high weight-to-volume ratio, which may necessitate FCL (Full Container Load) shipping to reduce the risk of damage compared to LCL (Less than Container Load).

Utilize Made-in-China.com's Secured Trading services to protect your payment until the goods pass inspection. Negotiate a warranty period of at least 2-5 years on the structural integrity and fire-resistant properties. Clearly define the Acceptable Quality Limit (AQL) in the contract, specifically mentioning that any door failing a smoke-seal or latching test upon arrival will be replaced at the supplier's expense.

Check for anti-dumping duties on steel products in your specific country, as these can significantly increase the total cost of ownership. Ensure the HS Code (typically 7308.30 for steel doors) is correctly declared to avoid customs delays. Always request a Certificate of Origin to potentially benefit from preferential tariff rates under bilateral trade agreements.