I have researched and experimented extensively with this product. It is well made and can easily compensate for the leakage of incoming air, usually around the nose, keeping well-filtered, positively pressurized air inside the mask, except for one downside: the air hose tends to kink and restrict airflow . It's difficult to find a practical carrying device and component layout to fix the problem. If the manufacturer fixes this problem, the product itself deserves a five-star rating.
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