OHS Code Explanation Guide

Published Date: July 01, 2009
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Part 18 Personal Protective Equipment

Section 253 Air purifying equipment

Adequate respiratory protection can also be provided to workers by air purification or filtration equipment if there is enough oxygen in the atmosphere and the concentration of airborne contaminants does not exceed the equipment’s capacity to filter them.

For contaminants with poor warning properties i.e. a contaminant at or above its occupational exposure limit that cannot be detected by smell or nose/throat irritation, the use of an air supplied respirator is recommended. Air purifying respirators may only be used if

(a) the respirator cartridge is equipped with an end-of-life indicator, or
(b) a change-out schedule is calculated by a competent person. The change-out schedule must be based on product information from the manufacturer or estimates based on knowledge of the effectiveness of the cartridge to remove the contaminant. The method used to calculate the change-out schedule must be the one developed by the U.S. Occupational Safety and Health Administration (OSHA), or an equivalent method.

For more information
Respirator Change Schedules
OSHA