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Mar 17, 2020·The N95 mask as designed, is rated for about 20 minutes of use. Thereafter, the moisture from the breath may clog up the filter material to a point where the suction created by the next breath taken, may cause the mask to allow more air in from the sides where it does not seal well to the face.

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Oct 14, 2009·The N95 respirators and Surgical N95 Respirators you received from the CDC Strategic National Stockpile are FDA-cleared medical devices with clearance in accordance with the Emergency Use Authorization of N95 Respirators issued by the FDA on April 27, 2009 and amended on May 1, 2009.

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