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What are the typical pressure losses?

In a well designed straight diffuser there is almost constant static pressure throughout.  The laser cut perforations are calculated (size/quantity to create the diffusion area) to match the available static pressure. In other words the Fabric Ducting system is designed based upon the available static pressure of the system.  Bends and other shaped pieces create losses which need to be taken in account (we do that automatically within our system design). Loss due to friction is usually minimal due to the decreasing air speed inside the Fabric Duct.  We normally require approximately 125pa – 150pa available external static pressure at the duct to accommodate the systems requirements (inflation, losses, air delivery). But we can accommodate pressures much lower if required by changing the designs or materials to suit.