Soft Rubber Breathing Mask Production Line SolidWorks, 3D Exported

The total inspiratory resistance of the respiratory mask should be no greater than 350pa, and the total expiratory resistance should be no greater than 250pa. Number of respiratory mask resistance tests and requirements: 4 samples, of which 2 are untreated samples and the other 2 are pretreated samples. If the sample under test has a different number, there should be two samples per number, one of which is untreated and the other one is pretreated.
Instructions:

1. Check the air tightness and working status of the testing device, adjust the ventilation volume to 85??1 L/min, and set the system resistance of the testing device to 0.

2. Put the sample under test on the matching test head model, adjust the wearing position of the mask and the tightness of the headband to ensure the tightness of the mask and the test head model. Then adjust the ventilation volume to 85??1 L/min, measure and record the inspiratory resistance.