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What respirators are suitable for use when 24-hour PSI exceeds 400?

When 24-hour PSI exceeds 400, respirators with higher PF such as full-face respirators are suitable. Powered air purifying respirators (PAPR) with full-face can also be used for greater comfort. Reference should be made to the Singapore Standard SS 548:2009: Code of Practice for Selection, use and maintenance of respiratory protective devices.