Excellent app
This is an excellent app for your typical mechanical/ HVAC calc’s that you may need to carry out on the go. The database is linked to CIBSE tables and gives colour coded indication if pressure drop or velocity exceeds recommended limits. Calculations for water & heating pipework, ventilation ductwork and gas pipework can all be done in one app. I have tried many other apps on the appstore and find this one my favourite by far.