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What velocities do we design to?

It’s pretty much the same as rigid duct.  We don’t like to go higher than 8.0m/s if possible, but generally we’ll design at velocities much lower than that for most non industrial applications and of course 2.0m/s or less for really quiet areas.  We provide noise data calculations for most selections so it’s easy to relate velocity/diameter/noise within a quotation and make any alterations required. Please talk to us about velocity and/or design questions if you have them.  Please also note we have a CIBSE certified CPD course available for basic Fabric Ducting design and selection.