North Safety Products offers a complete range of respiratory protection so that a ready-to-wear solution can be offered for any work situation. North’s respiratory protection can be broken down into the following groups: disposable APR masks, half masks, full- face masks, filters, powered air respirators and compressed airline systems. Nov 21, 2016 · N99 Air Masks. N99 air masks can filter up to 99% of the particulate matter 2.5 from the air. Just like the N95, they don’t work well against oil-based pollutants, but are better than the former ... Oct 22, 2016 · Yes, but first you need to understand that the spread of the virus requires attachment to dust, water mist or other flying debris in the air. Generally, dust particles and water must have a diameter.