It is important, because if workers don't have a good fitting respirator, then they may not actually be getting protection from dangerous particles in the air, which could lead to adverse health effects like cancer or asthma flare-ups. The best way to know whether you need to get a fit test done is through a comprehensive WHS consultation with a professional. There are different types of respirators that can be used, and the type you need will depend on the specific hazard. A tight-fitting respirator is one that forms a seal against the face to keep out hazardous particles. They come in many shapes and sizes, from masks to helmets, and are made of materials like rubber or plastic. A good fit is important for two reasons: First, it ensures that hazardous substances don't get into your lungs. Second, if the respirator doesn't fit well, it can be very uncomfortable and may cause workers to remove them prematurely. In some cases, poorly fitting respirators can even create dangerous air leaks which can lead to exposure to harmful substances. That is why respirator fit testing is so important. A fit test is a simple, non-invasive procedure that helps ensure that you have the right size and type of respirator for your face. It also checks to make sure the respirator seals properly against your skin and that you can breathe comfortably while wearing it. In addition, employers should also conduct regular lung function testing for their employees to ensure that they are not suffering from any work-related respiratory health disorders.