A broad topic that is afflicted with many misunderstandings. There are many ways to specify the operating pressure of ducts.
We assume the values that are best suited for the practice and have been repeatedly confirmed. The basis is the tear growth resistance. On the basis of the tear growth resistance, we calculate with the safety factor 2. All information relating to the strength of the fabric or the burst load is unrealistic. In particular cases, the duct is often damaged before the fan is operated for the first time. For example, when cutting the packaging or because the duct got caught on something during the installation, etc.
Operating pressures in Pa based on tear growth resistance with safety factor 2
|Diameter in mm||Quality of the materials|