Fit testing is a pre-requisite for wearing a respirator in order to ensure that a proper seal exists between the respirator and the user's face. This is deemed necessary ... respirators (i.e.

At least until now, as [Aris Alder] tackles the problem with an affordable DIY supplied-air respirator. Now, we know what you’re thinking, anything as critical as breathing is probably best left ...

A respirator with a half mask facepiece must achieve an overall fit factor of 100 and a respirator with a full-face mask must achieve an overall fit factor of 500 to be deemed acceptable for use.

Respirators, more commonly known as face masks, are meant to keep health care and emergency workers safe from chemicals and infectious particles. Surgical masks can be helpful if you are sick ...