Are fittings for duct built in?
Hello Lenin, you can specify a resistance for fittings on the ducts. There is not currently a library of fittings like those brought in with the pipe tables, however this is something we may implement for future releases.
What is the lowest and highest pressures allowed in analysis?
Hello Buddy, we do not currently limit the pressures allowed in the analysis. In general you are more limited by physics in your system, where depending on conditions you may get choked flow, drop below a fluids vapor pressure, etc. With ducts specifically if you have enough pressure your rectangular duct will probably end up more circular.