A respirator is a breathing quality enhancement devise that is designed to eliminate or minimize the exposure of the person utilizing a respirator to dusts, biological, particulates or chemical exposures. Because we as humans have different shapes and sizes of faces, respirators come in different shapes and sizes.  A respirator cannot protect you if it doesn’t perfectly fit your face. It’s that simple. According to OSHA, certain respirators, known as tight-fitting respirators, must form a tight seal with your face or neck to work properly. If your respirator doesn’t fit your face properly, contaminated air can leak into your respirator facepiece, and you could breathe in hazardous substances. So before you wear a tight-fitting respirator at work, your employer must be sure that your respirator fits you. Your employer does this by performing a fit test on you while you wear the same make, model, and size of respirator that you will be using on the job. That way, you know that your respirator fits you properly and can protect you, as long as you use it correctly.