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Table 1 The main classes of DPIs, based on their intrinsic resistance and pressure drop across the device

From: Dry powder inhalers and the right things to remember: a concept review

  Pressure drop across the device
Low resistance DPIs <5 Mbar 1/2 L/min −1
Medium resistance DPIs 5-10 Mbar 1/2 L/min −1
High resistance DPIs >10 Mbar 1/2 L/min −1