Fabric ducting & diffusers

High-quality materials of fabric ducts

Tailor-made fabric ducting solutions

Fabric ducting & diffusers can be of various shapes, dimensions, lengths, airflow distribution methods or suspension types. We make our fabric ducts from various fabric types of different colors. We offer fabric duct solutions for every situation that always correspond to demanding customer requirements.

Cross section of fabric ducting

Positive pressure only


The standard shape of fabric duct, easy maintenance, preferentially recommended.


For use where there is not enough space for circular fabric duct and for aesthetic fabric duct applications.


For use where there is not enough space for circular fabric duct, in aesthetic applications and if the fabric duct is to be installed in the corner of a room.


For use where there is not enough height for
a half-round fabric duct.


Available if the room corner construction requires a different shape of fabric duct to quarter round.



This shape of fabric duct requires a special suspension structure (provided) to clamp and support all corners.

Sizes and Diameters

We manufacture fabric ducting and diffusers of all dimensions from 100 mm to 2000 mm, each designed to specific requirements. The fabric duct inlets and connection spigots are always manufactured 10-15 mm larger than the specified size/diameter for ease of connection.

Dimension (values A, B)
diameter (A)
diameter (A)
radius (A)
width, height (A, B)
radius (A)
length of edges (A, B)


Determining the length of fabric ducting & diffusers depends primarily on the availability of space. We can manufacture a fabric ducting to deliver the same air volume whether the fabric duct is short or long, the precise design depends on the material type, perforation designs and system pressure.

fabric ducting length

A – beginning (edge /zip) – length  100mm – 200 mm
B – continuous part (zip/zip) – length 5000mm –10000 mm, these are multiplied to create the correct fabric duct length
C – blind part (zip/end) – length from 100mm to 11000 mm

Individual fabric duct parts are connecting with zippers; the number of zippers (or the distance between them) is flexible and can be specified by the customer.


Pressure losses of fabric ducting & diffusers are very similar to those in the traditional ducting. Calculating a more complex fabric duct distribution system is achieved using similar methods to those for sheet metal ducting. The minimum static pressure necessary to keep the correct shape of a fabric ducting or diffuser depends upon the weight of the fabric used. A minimum of 20 Pa is sufficient for light materials and 50 Pa necessary for medium and heavy ones.

The pressure distribution along fabric ducting is different from traditional sheet metal ducting because with declining airflow longitudinal velocity decreases. To verify the design of your fabric duct distribution system, please contact us.

fabric ducting pressure distribution

Let us prepare a tailor-made fabric ducting solution for you!

Cookie settings
Information about cookies
Cookies are used to improve websites, to display personalized content and to analyze visitor data. Technical cookies are necessary for the operation of the website - by using the website, you agree to their usege.
Technical cookies
always allowed
They provide key website features such as security, network management, accessibility, and basic traffic statistics. You can turn off technical cookies in your browser settings, but this can negatively affect the functionality of the website.
Performance cookies
They allow you to display relevant content and personalized offers and ads based on your interests on www.prihoda.com, on third-party sites, and on social networks.
Analytical cookies
Third-party tools (such as Google Analytics) allows to improve the way website works with information about usage. Cookies collect this information in a way that does not allow direct identification.
Allow all
Save settings