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Pressure Drop Charts

Pressure Drop Charts

Basic calculation data of spiral ducts & fittings based on European Standard. The rated nominal air flow resistance (P nom) should be corrected with regard to leakage and fans connection:


The air flow resistances are charted directly in Pa.

The data refers to the Total Pressure Drop Data, and the energy loss caused by air flow resistances can be measured directly. ( Pa = 1J/m )

The change of Pressure Drop can be read from below chart.

The different pressure drop data from 1st to Nth branches can be read from chart.

The change of pressure of 1,2 and 3 steps is evident.