These are designed to humidify and deliver the gases that a patient receives during mechanical ventilation, non-invasive ventilation, oxygen therapy, and laparoscopic surgery.
The theory is that narrower nostrils alter airflow in such a way that the mucus-covered nasal membrane can warm and humidify incoming air more efficiently.
The easiest and safest method to flatten parchment is to humidify and then dry and flatten it on the vacuum suction table rather than using the clips and tensioning frame.