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Wear your facemask, goggles and ear protection when cutting the wood.
There is the possibility that incorrectly assembled respiratory therapy devices connected to a tight fitting facemask could also be a hazard.
That would be the facemask -- a hard steel cage that protects the face from impacts.
Another experimental device is a facemask that provides resistance when the individual inhales but not during exhalation.
Using a facemask on a suitable manikin, demonstrate rescue breathing for 2 minutes.