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Standard Interpretations - Table of Contents
• Standard Number: 1910.134(h)(1)(iii)

OSHA requirements are set by statute, standards and regulations. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. This letter constitutes OSHA's interpretation of the requirements discussed. Note that our enforcement guidance may be affected by changes to OSHA rules. Also, from time to time we update our guidance in response to new information. To keep apprised of such developments, you can consult OSHA's website at http://www.osha.gov.

[November 2, 1998]

Richard Graham
Mine Safety Appliances Company
21 Sussex Court
Williamsburg, VA 23188

Dear Mr. Graham:

This is in reply to your letter, dated October 21, 1998, concerning SCBAs designed so that the exhalation valve is part of the mask mounted second stage regulator. You state that this SCBA does not have an inhalation or exhalation valve in the facepiece. Thus, the regulator is also contaminated by the wearer as evidenced by the presence of moisture inside the regulator when the unit is doffed.

You questioned whether the second stage regulator needs to be decontaminated in addition to the actual facepiece when the respirator is used for emergency use. The regulator would need to be cleaned and decontaminated as required by 29 CFR 1910.134(h)(1)(iii). Please note that the standard would require that such respirators meet all other requirements as detailed in the standard, e.g., NIOSH approval, air quality, etc.

Please contact this office if we may be of further assistance.


Assistant Regional Administrator

[Corrected 10/20/06]

Standard Interpretations - Table of Contents

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