In large-span steel structures—such as those found in automotive manufacturing and high-end equipment plants—the dead weight of the ventilation system is often a heavy burden on the structural design. Traditional metal ducts (including insulation) can weigh 15–25 kg per meter. In factories with spans exceeding 30 meters, this necessitates a web of support hangers and reinforcement purlins, driving up construction costs and crowding out valuable space for maintenance and production lines. Fiber Fabric Ducts​ are emerging as the optimal solution for "load reduction," leveraging their gram-level weight to relieve structural stress.

The core conflict in large-span steel structures lies in balancing "self-weight and deflection." The massive static load of metal duct systems significantly increases the internal forces on steel beams, forcing design institutes to specify higher-grade steel or larger cross-sections—driving civil construction costs up by 5%–8%. In contrast, fabric ducts weigh a mere 0.3–0.8 kg per meter, roughly 1/40th the weight of metal systems. Their impact on the main structure is几乎 (almost) negligible. This "lightweight" advantage allows structural engineers to eliminate dedicated duct supports, instead utilizing existing grid nodes for suspension, vastly simplifying the force-bearing system.

This engineering value is particularly evident in three typical scenarios:

• Ultra-Large Welding Shops:​ In a new energy vehicle factory with a 36-meter span welding shop, switching to fabric ducts reduced the ventilation system weight by approximately 3.2 tons. This allowed for a reduction in steel beam section height, freeing up 15 cm of vertical space for process equipment.

• Retrofitting Old Plants:​ In factories operating for over 20 years, the structural redundancy is often minimal. The "zero-burden" nature of fabric ducts allows for the addition of ventilation systems without expensive structural reinforcement, saving millions in civil reconstruction costs.

• Cleanroom Raised Floors:​ In electronics plants, a lighter ceiling load translates directly to fewer support columns for raised floors, effectively lowering the unit cost of cleanroom construction.

It is important to note that factory-specific fabric ducts must pass tensile strength and anti-aging tests​ to ensure dimensional stability under long-term tension. As green industrial building standards become stricter, fiber fabric ducts are evolving from mere ventilation equipment into "invisible assistants" for structural optimization—using the lightness of material science to uphold the stability and efficiency of large-span factories.