How important are protective masks during the renovations, I was again able to find the last Wednesday when I added a cable duct. The dust exposure has been enormous. That you are allowed to use any already used masks I had unfortunately also noticed.
Use of this form is self-explanatory. The comfort is good and not cut. The mask has no unpleasant odor. Of course, the inhalation is not fully accessible as exhalation. But the dust is completely excluded. The masks may only be used once.