The "Thermal Stratification Terminator" of Public Architecture: How Fabric Ducts Tame Heat Buoyancy in Large Spaces

In public buildings such as stadiums, waiting halls, and exhibition pavilions, the most overlooked pain point is "hot heads and cold feet." Once the ceiling height exceeds 6 meters, warm air rises and cold air sinks, creating a vertical temperature difference of 5–8°C. The upper space becomes a "heat reservoir that wastes energy," while the occupied zone still feels stuffy. Traditional metal ducts rely on a few diffusers for point-based air supply; no matter how far the jet reaches, it's difficult to "push" cooling capacity down to human height. Increasing fan speed only results in weak airflow at distant points, overcooling at proximal points, and soaring fan power consumption.

The solution of Fiber Fabric Ducts​ is not to "blow harder" but to "seep slowly from start to finish." Through fiber micro-perforation combined with directional micro-hole/slot jets, the entire tube becomes a long, linear plenum. Air escapes uniformly along the duct length at velocities controlled to 0.1–0.3 m/s. Cool air descends gently like an "air lake" rather than crashing into the crowd as a high-velocity jet. In large-span spaces, JetFlow-type long-throw nozzles supplement distant seating areas, while MicroFlow-type permeable sections cover the near zones. Vertical temperature differences can be compressed to within ±1°C, with horizontal differences ≤1°C.

Public buildings thus gain a triple dividend:

• Energy Savings:​ Surface-based air supply delivers heating/cooling directly to the occupied zone. Fan static pressure requirements drop, and overall ventilation energy consumption can be reduced by 15%–30%.
• Ceiling Height Savings:​ No external insulation or silencers are needed. The system can be installed close to the ceiling or beams, occupying 5–10 cm less headroom than metal systems.
• Dispute Reduction:​ Spectators no longer experience "front rows bundled in cotton coats while back rows sweat." Complaints from staff during events, performances, and exhibitions drop significantly.

Fire safety is not a weak point either: B1-class flame-retardant polyester fibers can be used in above-ground open public areas, while A2-class fluorosilicone fabric is available for high-rise, underground, or high fire-rated locations. Fire dampers are installed across fire compartments per regulations.

As the criterion for evaluating HVAC in public buildings shifts from "is there airflow?" to "is everyone equally comfortable?," the value of fiber fabric ducts becomes clear—they don't fight heat buoyancy head-on; instead, they work with the physical nature of air to smooth out large spaces.