In the USA, OSHA REQUIRES employers to “Fit Test” each worker who will wear a tight-fitting respirator. This includes all types of tight-fitting respirators, from half-face air purifying respirators to full-face supplied air respirators. The workers are also REQUIRED to be fit tested with EACH MAKE, MODEL STYLE and SIZE face piece they are medically qualified and trained to wear. But it is the METHOD of fit testing that is often overlooked…