Fabric Ducting has many different names, from Air socks (or airsox) to textile diffusers, textile ducts, canvas ducts (they definitely are NOT made of canvas!), from textile ducting to air sleeves or even wind socks.   We think Fabric Ducting & Diffusers is the most accurate term.

Prihoda products are usually acting as both supply air ducting (air transfer) as well as air distribution/diffusion into the occupied zone. We supply both types of system, (1) positive pressure distribution systems (supply air) and (2) negative pressure (extract /return air) ducting for exhausting air from rooms.


1/ Air outlet from a diffuser

Supply air (see V below) flowing into the diffuser through either end or an inlet spigot, can exit the diffuser in any of the following methods:

A - through an outlet end – air leads to another system/area

B - through microperforations – either 200  – 400 µm laser cut holes in the fabric

C - through perforations – laser cut holes with a diameter greater than 4 mm

D - through small fabric nozzles

E - through big fabric nozzles

F - through an adapter/outlet spigot – air is diverted to another system/area

G - through an outlet end – air leads to another system/area

Fabric ducting - Air diffuser


It always holds true that:  V = A + B + C + D + E + F + G (certain values of A, B, C, D, E, F, G may be zero)


2/ Air entry into negative pressure (extract) ducting

Perforations are used to allow extract air into negative pressure ducting.

Fabric ducting - Air duct




3/ Air transfer ducting

Ducting made from impermeable fabric or insulated ducting transports air to the destination WITHOUT diffusion. We have the technical ability to design and manufacture, branches, bends and other fittings for any situation.

Fabric ducting - Air transfer duct