The technique and principle of the active anterior rhinomanometry were justified by human examination and model experiment. The resistance values obtained from anterior method did not always agree with those from posterior one. Causes of the disagreement were considered to be distortion of the nostrils, air leakage from the apparatus and resistive component in the nasopharynx. These possibilities were demonstrated and analyzed in model experiments. The anterior rhinomanometry was concluded as a precise and convenient method to assess the conductivity of the nasal cavities.
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