Review from dpreview.com

North by Honeywell 7900 Series Emergency Escape Mouthpiece Respirator offers a quick and economical method to escape non-IDLH emergency situations. As a disposable air purifying respirator designed for emergency escape from ammonia contaminated atmospheres, it consists of a silicone mouthpiece, a nylon neck strap, a wider nose clip, a soft textured mouthpiece that will not slip, large/soft and flexible nose pads that are held on a balanced spring and a mouthpiece with a wider opening for a more natural feel. Structured for emergency use at pulp and paper mills, water treatment plants, pools and spas, chemical plants and other facilities that may have accidental exposure to chlorine, chlorine dioxide, sulfur dioxide or hydrogen sulfide.