Fabric air ducting: a high-performance solution for ventilation, air conditioning, and heating
Fabric air diffusion is now a high-performance and flexible solution for ventilation, air conditioning, and heating systems in industrial, logistics, and tertiary buildings.
Unlike traditional ductwork made of rigid materials, the fabric duct ensures air diffusion through various methods: fabric porosity, perforations, or nozzles. This allows control of air velocity, improves distribution uniformity, and limits stratification phenomena.
Lightweight, modular, and easy to install, fabric ducting adapts to many building configurations and meets the requirements for airflow comfort, aeraulic efficiency, and maintenance of HVAC installations.
At F2A, each fabric air diffusion system is designed specifically for every project to guarantee homogeneous air distribution, controlled aeraulic performance, and optimal integration into the building environment.
Why choose fabric air diffusion?
Fabric air ducting has established itself as a high-performance alternative to traditional ductwork in many HVAC (heating, ventilation, and air conditioning) systems.
Unlike metal ductwork, which requires the installation of diffusers or grilles, fabric ducts simultaneously handle both air transport and diffusion. Thanks to different diffusion principles—fabric porosity, perforations, or linear slots—they allow precise control of air velocity, throw distance, and distribution uniformity in the occupied zone.
This technology offers several major advantages for industrial, logistics, and commercial buildings:
Fabric ducting helps improve thermal comfort, indoor air quality, and the energy efficiency of HVAC systems, while also simplifying on-site installation.
| CRITERIA | FABRIC DUCT | METAL DUCTWORK (SHEET METAL) |
|---|---|---|
| Diffusion principle | Integrated diffusion through porosity, perforations, or slots | Air transport only, diffusion via grilles or diffusers |
| Diffusion uniformity | Very uniform along the entire length | Localized diffusion at terminals |
| Thermal stratification | Effective reduction in large spaces | More pronounced stratification |
| Weight | Very lightweight | Heavy structure |
| Installation | Fast installation, requires minimal lifting equipment | Longer installation with heavier handling requirements |
| Adaptability | Easily adaptable to buildings and processes | More complex modifications |
| Maintenance | Removable and washable | More complex cleaning |
| Aesthetics | Architectural integration possible (colors, shapes) | Standard technical appearance |
Air diffusion principles with fabric ducting
The performance of fabric air diffusion relies on controlling the aeraulic phenomena that govern air distribution within a space. Unlike metal ductwork equipped with localized diffusers, fabric ducts provide continuous air diffusion along their entire length, promoting a more uniform distribution of air throughout the treated volume.
The behavior of supplied air mainly depends on three key parameters: the type of diffusion, residual air velocity, and thermal stratification.
Choosing the diffusion type: through fabric porosity, mixing, or induction
In fabric duct systems, the choice of diffusion type is closely linked to the geometry and layout of the diffusion zones (porosity, perforations, or slots). Depending on the selected diffusion principle, it is possible to achieve:
Low-velocity diffusion, promoting gradual air mixing
Calibrated air jets, increasing throw distance and improving air mixing in large spaces
A properly sized air diffusion system ensures a more uniform temperature in the occupied zone and prevents air stagnation areas.
Residual air velocity in the occupied zone
Residual velocity corresponds to the air velocity in the occupied zone after the jet’s energy has dissipated. This parameter is essential to ensure occupants’ thermal and aeraulic comfort. A well-designed air diffusion system must:
Deliver properly mixed air to the occupied zone
Maintain an air velocity compatible with comfort requirements
Fabric ducts allow precise control of air velocity thanks to the distribution of diffusion along the entire length or over part of the duct. This enables proper system sizing while limiting localized drafts often observed with point diffusers—or, conversely, creating them when required by the process.
Control of thermal stratification
In high-ceiling buildings—such as warehouses, industrial halls, or logistics facilities—warm air naturally tends to accumulate at higher levels. This thermal stratification can lead to significant temperature differences between the ceiling and the occupied zone.
A properly designed fabric air distribution system helps limit this phenomenon by promoting air mixing within the space. Depending on the selected diffusion principle, the supplied air can:
Be diffused gently to homogenize temperature
Be projected as jets to bring treated air back into the occupied zone
Controlling thermal stratification directly contributes to improved thermal comfort and optimized energy performance of HVAC systems.
Different types of air diffusion with fabric ducting
Air diffusion using fabric ducts can be achieved through several technical principles. The choice of diffusion mode mainly depends on room height, airflow rate, thermal loads, and comfort requirements in the occupied zone.
Each diffusion technology allows specific control of:
Air throw
Residual air velocity
Thermal uniformity within the space
Fabric ducts can therefore be configured to meet the specific constraints of ventilation, air conditioning, or heating systems.
The main diffusion modes are:
- Fabric porosity (mixing diffusion)
- Slots (linear diffusion)
- Induction (via perforations or nozzles)
Diffusion through fabric porosity relies on the natural permeability of the textile. Air is evenly distributed across the entire surface of the duct through the micro-openings in the fabric. This low-velocity diffusion principle allows for:
- Very low residual air velocity in the occupied zone
- Uniform air distribution
- No perceptible drafts
This diffusion mode is particularly well suited to environments requiring a high level of comfort and precise airflow control, such as:
- Cleanrooms
- Laboratories
- Food processing industry
Note: This type of diffusion is not suitable for heating applications.
Diffusion through longitudinal or oriented slots generates more structured air jets with greater throw. It provides medium-velocity diffusion (4 < V < 10 m/s) using slots specifically sized for each project. Air is supplied through calibrated openings that direct airflow in the desired direction.
This type of diffusion allows for:
- Mixing ambient air and promoting induction
- Achieving longer air throw
- Enhancing air mixing in large volumes
Slot fabric ducts are particularly well suited for:
- Food processing industry
- Low-height industrial or logistics buildings
- High thermal load environments
This technology often represents a compromise between low-velocity diffusion and the ability to deliver air effectively into the occupied zone.
Depending on the environment and layout, the Coanda effect can also be utilized to improve jet stability and enhance thermal uniformity in critical areas.
Perforated fabric ducts diffuse air through multiple calibrated perforations across the entire surface of the duct. They are designed for medium-velocity air diffusion (4 < V < 15 m/s) via ducts with dimensions defined specifically for each project. Depending on the induction level, they help manage temperature differences while maintaining controlled residual air velocities, ensuring optimal comfort. Air injection at higher velocity significantly reduces temperature differences along the duct.
The objective is to achieve uniform temperature distribution within the treated zone while ensuring occupant comfort. This principle generates controlled air jets that promote both induction and air mixing within the space.
Compared to porous diffusion, perforation allows:
- Increased air throw
- Improved air mixing
- Better handling of higher thermal loads
This solution, based on the induction principle, ensures homogeneous distribution of supply air within the space and helps limit thermal stratification.
It is particularly suitable for:
- High-ceiling buildings
- Industrial and logistics facilities
- Production areas
- Medium-height commercial spaces
- Public buildings (ERP – establishments open to the public)
Applications of fabric air ducting
The selection of a fabric duct for ventilation, air conditioning, or heating mainly depends on the building configuration, ceiling height, thermal loads, and hygiene or maintenance requirements.
In industrial environments, controlling air diffusion is essential to ensure comfortable working conditions and optimal process performance.
Industrial fabric ducts provide uniform air distribution in often large spaces while limiting thermal stratification.
They are particularly well suited for:
- Production workshops
- Mechanical industries
- Electronics industries
- Assembly areas
Their lightweight design and ease of installation also help simplify on-site work and future modifications to the ductwork.
Warehouses and logistics platforms typically feature high ceilings and large volumes that are difficult to treat with conventional air distribution systems.
Fabric ducts used in warehouses can generate air jets capable of reaching the occupied zone while promoting air mixing throughout the space. This approach helps reduce thermal stratification and improves heating and cooling efficiency. They therefore provide an effective solution for:
- Logistics warehouses
- Distribution centers
- Storage platforms
- High-ceiling industrial buildings
- Food processing industry
In the food industry, requirements for hygiene, maintenance, and indoor air quality are particularly stringent. Fabric ducts designed for these applications offer several advantages:
- Washable fabric surfaces
- Quick installation for downtime reduction
- Low-velocity diffusion limiting drafts
- Good control of air distribution in critical areas
They are commonly used in:
- Food processing workshops
- Packaging areas
- Cold rooms
- Preparation areas
In controlled environments, airflow management must maintain strict standards of cleanliness, pressure, and air distribution. Fabric ducts used in laboratories provide uniform air diffusion at low velocities, ensuring controlled and stable airflow within critical areas.
These solutions are particularly well suited for:
- Laboratories
- Pharmaceutical industries
- Cleanrooms
- Medical environments
Fabric ducts are also used in commercial buildings and certain public facilities (ERP – establishments open to the public), particularly when a discreet and aesthetic solution is required.
They combine aeraulic performance with architectural integration, offering a wide choice of shapes, colors, and configurations. They are commonly found in:
- Sports facilities
- Multi-purpose halls
- Commercial spaces
- Office buildings
How to properly size a fabric air diffusion system
Proper sizing of a fabric air diffusion system is essential to ensure optimal performance. The air diffusion mode, duct configuration, and operating conditions must be defined according to the specific characteristics of the building and the comfort requirements of occupants.
Even air distribution
An appropriate air speed in an occupied area
Mastering thermal stratification
Optimal energy efficiency of the HVAC system
Several key parameters must be considered:
The airflow rate to be supplied is the primary sizing parameter. It depends on:
- The ventilation requirements (fresh air, air changes)
- The thermal loads to be handled (heating or cooling)
- The intended use of the space
An accurate calculation of airflow ensures proper system operation and effective air distribution.
Ceiling height directly influences the choice of diffusion principle.
In large-volume spaces, it is often necessary to use diffusion systems capable of projecting air into the occupied zone. Conversely, in low-height spaces, low-velocity diffusion should be preferred to avoid drafts.
Thermal loads (heat gains or losses) significantly impact system design. They depend on:
- Occupancy density
- Equipment and machinery
- Solar gains
- Building insulation
Proper evaluation of these loads allows for selecting the appropriate diffusion mode and ensuring thermal comfort.
Air velocity in the occupied zone is a key factor for comfort.
Excessive velocity can cause discomfort due to drafts, while insufficient velocity may lead to poor air mixing.
The system must therefore be designed to maintain air velocity within acceptable comfort limits.
An aeraulic study is essential to validate system performance.
It helps to:
- Optimize air distribution
- Validate air velocities in the occupied zone
- Ensure thermal uniformity
- Prevent stratification and stagnant zones
This approach ensures controlled air diffusion adapted to the actual constraints of the building.
Aeraulic simulation and air diffusion optimization (CFD)
In fabric air diffusion projects, certain building configurations may present significant aeraulic constraints: large volumes, high ceilings, variable thermal loads, or the presence of equipment influencing airflow patterns.
In such cases, the use of CFD (Computational Fluid Dynamics) simulation helps design and optimize the air distribution system. CFD simulation consists of numerically modeling airflow within the building and accurately analyzing air behavior, including supply air jets and temperature gradients.
Aeraulic modeling allows visualization of air circulation within the building volume and helps anticipate phenomena that may affect diffusion performance. It enables analysis of:
- Air throw from fabric duct supply jets
- Induction levels and air mixing within the space
- Air velocity in the occupied zone
- Temperature distribution
- Thermal stratification effects
These simulations ensure that treated air effectively reaches the occupied zone while meeting thermal comfort and acceptable air velocity requirements.
Learn more about air diffusion
CFD analysis also allows precise adjustment of fabric duct system parameters. It can be used to:
- Determine the most suitable diffusion type (porosity, perforations, or slots)
- Optimize duct diameter and positioning
- Adjust diffusion zone configuration
- Validate performance in heating and cooling modes
This approach ensures a solution perfectly adapted to the building constraints while minimizing the risk of discomfort or poor air distribution.
Fabric air diffusion project study
Each fabric air diffusion project involves specific constraints related to the building architecture, required airflow rates, and thermal comfort requirements. This is why designing a high-performance air distribution system relies on a thorough preliminary technical analysis.
At F2A, our teams support consulting engineers and project owners in defining and sizing fabric air diffusion solutions tailored to each application.
Our design approach determines the most suitable solution by taking into account:
- Airflow rates and ventilation, heating, or cooling requirements
- Building height and geometry
- Thermal loads within the space
- Acceptable air velocities in the occupied zone
- Operational and maintenance constraints
Based on these parameters, our teams define:
- The most appropriate diffusion principle (porosity, perforation, slots, jets)
- Fabric duct sizing
- Distribution of diffusion zones
- Suspension system and associated accessories
For more complex projects, this study can be complemented by a CFD (Computational Fluid Dynamics) simulation to validate airflow behavior and optimize air distribution within the space.
This approach ensures a reliable, high-performance solution perfectly suited to the constraints of your HVAC installation.
Our teams are available Monday to Thursday from 8 a.m. to 5:30 p.m. and Friday from 8 a.m. to 4:30 p.m.