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CROSSTEES <br />The cross member that interlock wilh <br />the main beams, also known as cross <br />runncrs or cross T-bars. <br />DIFFUSER <br />A circular or rectangular metal grill <br />used tor the passage of air from a <br />ducled system. <br />ESSENTIAL SERVICE BU�LDINGS <br />Any buildings designed to be used <br />by public agencies as a tire station, <br />police station, emergency operations <br />center, State Patrol otiice, sheriffs <br />office, or emergency communication <br />dispatch center. <br />GRID <br />The main beams and c�oss tees of the <br />suspension system. <br />HANGER WIRE <br />10 or 12 gage soft annealed wire used <br />as primary supporl (or the grid system. <br />Also called suspension wires. <br />NV1/CB <br />NORiHN[SiWALL4 CCNNG BUR[.W <br />LATERAL PORCE BRACING <br />The bracing method used lo prevenl <br />ceiling uplift or restrict Iaterai move- <br />ment during a seismic event. Lateral <br />torce bracing consists of vertical struts <br />and sp�ay wires. <br />MAIN BEAM <br />The primary suspension member sup- <br />ported by hanger wires, also known as <br />the main runner, carrying tee, carrying <br />runner or mains. <br />MOLDING/CLOSURE ANGLE <br />A light gauge metal angle cr chan- <br />nel fastened to the perimeler wall or <br />partition to <br />support ihe perimeter ends nf an ac- <br />cousticai ceiling grid. <br />PERIMETER CLIPS <br />Proprietary angle brackel attached di- <br />rectly to the wall molding/closure angle <br />which allows tor'/.' movement in the <br />event of seismic activity and intedocks <br />properly with ends ot grid system. <br />PERIMETER WIRES <br />Hanger wires placed within eight inches <br />o( the surrounding �valls. <br />PLENUM <br />The space above a suspended csiiing. <br />SLACK WIRE <br />A 12 gage wire that is nol tighl or taut. <br />SPREADER or SPACER BAR <br />A bar with notches to prevent the sus- <br />pension system from separating, also <br />called a stabilizer bar. <br />SPLAV WIRES <br />Wires inslalled at an angle rather than <br />perpendicular to the grid. <br />VERTIC�L STRUTS <br />The rigid vertical member used in <br />lateralforce bracing ofthe suspension <br />system. Also known as compression <br />posts, seismic pods, seismic struts. <br />Common materials are electrical con- <br />duit (EM'Ij, metal st�ds or proprietary <br />producis. <br />t032-A NE 65th St. The NWCB has been serving the construction <br />Seattle, WA 98115 indusiry for over torty years. It is recognized <br />Phone �206) 524-4243 as a technical authority, educational body and <br />Fax (206) 524-4136 spokesperson tor the wall and ceiling industry. It <br />Toll Free �800) 524-4215 provides services to architects and the con- <br />info�nwcb.org struction community on all matters relating to <br />www.nwcb.org <br />NWCB - Oregun <br />Phone: (503) 295-0333 <br />Fax: (503) 295-2733 <br />B.C. Wall and Ceiling Assucialion <br />Phone: (604) 575-0511 <br />Fax: (604) 597-7208 <br />Alberta Wall and Ceiling Association <br />Phone: (403) 250-7045 <br />Fax: (403) 291-9515 <br />the diversified wall and ceiling industry. <br />As Ihe indusiry's development and coordina- <br />tion organization, the NWCB saw the need to <br />establish a document to provide clarification and <br />lhe intent of NEHRP (National Earthquake Haz- <br />ards Reduction Program) an agency ot FEMA <br />(Federal Emergency Management Agency). It <br />is meant to serve as a set of recommendations <br />and is not intended tor any speci(ic conslruction <br />project. <br />The NWCB makes no express or implied war- <br />ranry or guarantee. <br />� <br />� <br />