Mask. For the mask, see the hygienic requirements for rhinomanome- try. The device and the mask must be autoclavable. A bacterial filter is not suitable, as it would not allow for comparison with normal peak flow values. Unintentional exhalation or blowing the nose during an attempt to obtain the first PNIF measu- rement might contaminate not only the mask but also the measuring device. The impact of mask tightness in males with a ▇▇▇▇▇ has not been clarified for PNIF measurement so far.
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Sources: International Consensus Agreement, International Consensus Agreement