There are many different fabric properties for many different applications.
Duct shrinkage can be a serious problem if uncorrected. Suppose you take down a duct to wash it and afterwards it is two feet shorter and two inches smaller in diameter. This could be a real problem when trying to use your existing suspension system. With FabricAir ducts this is not an issue due to our high quality manufacturing process. FabricAir ducts are preshrunk at the factory and won't shrink any more than 0.5% over the lifetime of the duct.