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CROSSTEES <br />The cross member that inledock with <br />Ihe main beams, also Icnown as cross <br />runncrs or cross T-ha�s. <br />DIFFUSER <br />A dreular or reGangular metal grill <br />used lor the passage of air trom a <br />duded syslem. <br />ESSENTIAL SERVICE BUILDINGS <br />Any buildings designed lo be used <br />by public agencies as a lire slation, <br />police station, emergency operations <br />cenler, Slate Patiol otfice, sheritPs <br />ol(ice, or emergency communicalion <br />dispatch center. <br />GRID <br />Thc main beams and cross lces of thr. <br />suspension syslem. <br />HANGER WIRE <br />10 or 12 gage soll annealed wire used <br />as primary supporl br the �rid system. <br />Also called suspensian wires. <br />NWCB <br />voc��nvtv wc,t u cui��r, ocA�nu <br />LATERAL FORCE BHACING <br />The bracing melhod used to prevent <br />ceiling uplilt or resirict lateral move- <br />ment during a seismir, evenL Lateral <br />lorce bracing consis�s ot vertical struts <br />and splay wires. <br />MAIN BEAM <br />The primary suspension membcr sup- <br />ported by hangcr wires, also known as <br />ihe main runner, carryin9 tee, carrying <br />runner or mains. <br />MOLDING/CLOSURE ANGLE <br />A light gauge metal angle or chan- <br />nel fastened to the perimeler wall or <br />partilion to <br />suppor� the perimeter ends of an ac- <br />eouslical ceiling grid. <br />PERIMETER CLIPS <br />Propnetary angle bracket allached di- <br />rectly lo ihe wall molding/closure ang�e <br />which allows lor ?:' movemenl in the <br />event ot seismic aclivity and interlocks <br />propedy wilh cnds ol grid system. <br />1032-A NE 65�It St. <br />Scallle, WA 98115 <br />Phonc (206) 524-4243 <br />Fax (20G� 524-413G <br />Tall Free (800) 524-4215 <br />inlownwcb.org <br />www.nwcb.or9 <br />NWCB - Oregon <br />Phone: (503) 295-0333 <br />Fax: (503) 295-2733 <br />B.C. Wall and Ceiling Association <br />Phone: (u0�1) 575-0511 <br />Fax: (604) 597-7208 <br />Albcrta Wall and Ceiling Association <br />Phone:(403)250-7045 <br />Fax: (403) 291-�J515 <br />PER�METER WIRES <br />Hangc� wi�es placed within eight inches <br />ol Ihe surrounding walls. <br />PLENUM <br />The space above a suspended ceiling. <br />SLACK WIRE <br />A 12 gage wire that is not tight or taut. <br />SPREADER or SPACER BAR <br />A bar with notches to prevent the sus- <br />pension system from separatiny, also <br />called a stabilizer bar. <br />SPLAY�WIRES <br />Wires inslalled al an angle rather Ihan <br />perpendicular to the grid. <br />VERTICAL STRUTS <br />The ri9id vcrtical member used in <br />lateral lorce bracing ot ihe suspension <br />sys�em. Also known as compression <br />posls, seismic pods, seismic struls. <br />Common materials are electrical con- <br />duit (EMn, melal studs or proprictary <br />producls. <br />The NWCk3 has becn serving the construetion <br />industry 1ar over forty years. It is recognized <br />as a technical authority, educational body and <br />spokesperson for the wall and ceiling induslry. It <br />provides services to architects and the com <br />siruction community on all matters relating ro <br />ihe divc�sitied wall and ceiling indusiry. <br />As the industry's development and coo�dina- <br />tion organizalion, ihe NWC6 saw ihe need to <br />establish a documenl to pwvide claritication and <br />ihe intent of NEHRP (National Earthquake Haz- <br />ards Reduction Program) an agency of FEMA <br />(Federal Emergency Managemenl Agency). It <br />is meant to serve as a set of reco�T.�ndations <br />and is noi intended for any specitic construction <br />project. <br />The NWC� makes no express or implied war <br />ranry or guarantee. <br />� <br />