File:Three Key Factors Required for a Respirator to be Effective (Spanish).jpg
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![File:Three Key Factors Required for a Respirator to be Effective (Spanish).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/f/fd/Three_Key_Factors_Required_for_a_Respirator_to_be_Effective_%28Spanish%29.jpg/800px-Three_Key_Factors_Required_for_a_Respirator_to_be_Effective_%28Spanish%29.jpg?20200328223848)
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