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A fit test confirms that a specific respirator model can form an adequate seal on an individual’s face, preventing harmful particles from bypassing the filter. When a leak occurs, contaminants can enter the breathing zone regardless of the respirator’s filtration rating, making the protection ineffective. OSHA recognizes two categories of fit testing: Quantitative Fit Testing (QNFT) Measures actual leakage using instruments such as the TSI PortaCount. Generates a numerical fi