FireDetection,Heat-ActuatedHeatsensitivedevicesmaybeeither"spot"or"line"typeandoperateatafixedtemperatureoronarapidincreaseintemperature(rate-of-rise).Somedetectorscombinethefixedandratesensitiveprinciples.Thespacingguideslistedareindicativeofeachdetector"srelativesensitivityand,ineachcase,thespacingguideisthemaximumrecommendedseparationbetweendetectorsforsmooth-ceilinginstallations.Foragiventemperaturerating,afixed-temperaturedetectorwhichhasa30ft(9m)listingandonewhichhasa15ft(5m)listingwillbothrespondatapproximatelythesametimetoageometricallygrowingfireifeachisinstalledatitslistedspacing.FMApprovedrate-of-risedetectorsallhave30ft(9m)listedspacings,themaximumseparationrecommendedbyFMApprovals.Installationofheatdetectorsatlessthanmaximumspacingisnecessary:toachieveearlierresponse;tocompensateforceilingobstructionssuchasbeamsandjoists;andtocompensateforceilingheightsgreaterthan15ft(5m).Properlocationanduseofheatdetectorsinvolvesconsiderationofceilingconstruction,thelocationofpartitions,themaximumnormalroomtemperature,heatproducedbytheoccupancy,andwhetherdetectorfunctionistowarnoccupantsortoautomaticallyactuateprotectionequipment.RefertoStandard72-1993oftheNationalFireProtectionAssociationanddesignspecificationspublishedbyjurisdictionalauthorities,asappropriate.
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