The fire-proof sealing performance of the fire-rated stainless steel flag door hinge plays a significant role in reducing the spread of smoke in a fire. This effect is due to its effective blocking of the gap between the door body and the door frame. The smoke generated in a fire is an important factor threatening life safety. Smoke not only blocks the line of sight, but also contains toxic gases. The gap between the door body and the door frame is often one of the main channels for smoke to spread. The hinge with good fire-proof sealing performance will fill these gaps tightly when the door body is closed through a special structural design, forming a physical barrier to prevent smoke from penetrating from the gaps, and buying precious time for personnel evacuation and rescue.
The realization of this sealing performance depends on the close fit between the hinge and the door body and door frame. The installation part of the hinge is precisely processed to ensure that it fits the contact surface with the door body and door frame to reduce the generation of gaps. At the same time, some hinges will be equipped with high-temperature resistant gaskets or sealing strips. These materials remain elastic at room temperature and can fill small gaps; in the high-temperature environment of a fire, they will not lose elasticity due to heat and can still maintain the sealing effect. When the door is closed, the hinge drives the door to fit tightly with the door frame, and the gasket expands further under pressure, completely blocking any gaps that may exist, making it difficult for smoke to find a channel to spread.
When a fire occurs, the door may deform due to the increase in temperature. If this deformation is not handled properly, it will cause new gaps between the door and the door frame, creating opportunities for smoke to spread. The structural stability of the fire-rated stainless steel flag door hinge can suppress the deformation of the door to a certain extent, or adapt to the deformation through its own adjustment ability to maintain a sealed state. For example, the hinge sleeve is made of high-strength stainless steel, which is not easy to deform at high temperatures, ensuring that the door can still maintain its relative position with the door frame when it expands due to heat, and the gasket can also be adjusted accordingly to continue to block any gaps that may appear, avoiding sealing failure caused by deformation of the door.
The fireproof sealing performance is also reflected in the hinge's maintenance of the door's closed state. The airflow and shock wave generated in the fire may push the door open, destroying the original sealing state and allowing smoke to spread. Hinges with good sealing performance usually have automatic door closing function or stronger locking structure, which can quickly close the door body after it is pushed open, or firmly lock the door body in the closed state to resist the impact of airflow and shock waves. This stable maintenance of the closed state ensures the continuity of the sealing barrier, so that smoke is always blocked in a specific area to prevent it from spreading to the evacuation passage or other spaces not affected by the fire.
For multi-story buildings or complex building structures, the sealing performance of fire-rated stainless steel flag door hinge can cooperate with fire doors to form a zoning smoke control effect. The building is divided into multiple independent areas by fire doors. The door body of each area maintains airtightness when closed through the sealing effect of the hinge. When a fire occurs in a certain area, the smoke will be confined to the area and it is difficult to spread to other areas through the gap of the door body. This zoning control can effectively reduce the impact range of smoke, keep the non-fire area in a relatively clean air environment, provide safe passages for the evacuation of people on different floors and in different areas, and reduce the harm of smoke to more people.
In the case of high smoke concentration, the sealing performance of the hinge can also reduce the burden on the ventilation system. The ventilation system of a building will start the smoke exhaust function in the event of a fire. However, if the gap in the door body causes a large amount of smoke to spread, the amount of smoke that the smoke exhaust system needs to handle will increase significantly, which may exceed its design load and affect the smoke exhaust effect. Hinges with good sealing performance can reduce the amount of smoke diffusion, allowing the smoke exhaust system to more efficiently handle smoke in specific areas, maintain effective smoke exhaust efficiency, avoid untimely smoke exhaust due to excessive smoke, and further control the diffusion rate of smoke.
The fire-proof sealing performance of the fire-rated stainless steel flag door hinge can also reduce the erosion of smoke on the door body and surrounding structures, and indirectly maintain the durability of the sealing effect. Smoke contains a large amount of corrosive gases and particles. If it spreads from the gap, it will adhere to the surface of the door body, door frame and hinge, accelerating the damage of these components. The sealing performance prevents the penetration of smoke and reduces the contact between corrosive substances and these components, so that the door body and hinges maintain structural integrity in the fire, and the sealing function can continue to work, and will not fail prematurely due to corrosion and damage of components, ensuring that smoke can always be blocked from spreading during the fire.
In addition, this sealing performance also has a certain effect on the psychological comfort of people during evacuation. When people pass through the fire door in a fire, if they can feel the tightness of the door after closing and no obvious smoke coming out of the gap, it will enhance their confidence in the safety of the evacuation passage, reduce panic, and evacuate in a more orderly manner. This positive psychological impact can improve evacuation efficiency and indirectly reduce casualties caused by chaos. The basis of all this is the effective control of smoke diffusion by the hinge sealing performance.
