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data-bvcsref="http://answers.grainger.com/answers/5049-en_us/product/4GM24/subscribeanswers.htm?format=embeddedrpc&contentid=109512&answers=true&user=__USERID__&authsourcetype=__AUTHTYPE__" data-bvtrack="eventTarget:Product,eName:ProductFollow" data-bvcsappcode="qa" name="BV_TrackingTag_Question_Display_SubcribeContent" class="BVDILink BVDI_CSSubmitLink" data-bvcssubjectid="4GM24" href="javascript://" data-bvcssubjecttype="product"><span class="BVDILinkSpan">I have this question too</span></a></div></div> <div class="BVQAQuestionAnswerDivider"><h2 class="BVQAQuestionAnswerDividerHeading">Answers </h2></div><div id="BVQAQuestion109512Answers" class="BVQAAnswers"><div id="BVQAAnswer125892" class="BVQAContent BVQAAnswer BVDI_BAContentTop10Contributor"><div class="BVDI_BA BVDI_BAAnswer"><div class="BVDIInside BVDI_BAInside"><div class="BVDIBody BVDI_BABody"><ul class="BVDI_BAList"><li class="BVDI_BAItem BVDI_BAItemOdd BVDI_BAItemContributor BVDI_BAItemTop10Contributor"><a onclick="return false;" class="BVDILink BVDILinkDisabled" title="Top 10 contributor" id="BVDI_BABadge_ag9takb770yp1nafiw7f37gnk_ID"> <span class="BVDILinkSpan">Top 10 contributor</span></a></li></ul></div></div></div><div class="BVQAContentText BVQAAnswerText"><div class="BVQAContentLabel BVQAAnswerLabel">Answer: </div>Grainger has contacted the product supplier and has been advised by them of the following, PN# 4GM24 the Emergency Escape MouthBit Respirator by North Mfg. has an indefinite shelf life. This should be kept in its original packaging sealed until expected to be used. North Mfg. suggests this to be stored in a cool dry environment.<br /><br />Thank you for using Grainger Ask and Answer.</div><div class="BVQAContentData BVAnswerData"> <div class="BVQAElapsedTime">3 months, 1 week ago</div><div class="BVQASignature"><div class="BVQAWrittenBy">by </div><div class="BVQANickname"><a title="Read all my Q&A" data-bvtrack="eName:ProfileLink" onmouseout=" bvProfileSnapshot.hideOpenPopinAfterDelay(1000 ,250 ); " name="BV_TrackingTag_Answer_Display_ReadAllQA_AmyH" class="BVQANickname" onclick="var popupWin = window.open(this.href, null, 'resizable=1,status=1,scrollbars=1,width=800,height=600,top=0'); popupWin.focus(); event.preventDefault?event.preventDefault():event.returnValue = false;" href="http://ugc.grainger.com/profiles/5049-en_us/AmyH/profile.htm" onmouseover=" bvProfileSnapshot.showHiddenPopinAfterDelay('BVDI_PSPopin_eh64oi2al33781qm3esfq6471_ID', 'http://answers.grainger.com/answers/5049-en_us/AmyH/profilesnapshot.djs?format=embeddedhtml', 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