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<br />___" !: ~~I ~~.?7: 5~~_2 447 2248 <br /> <br />ACOUST. CDt-JCEPr;, !t,jC. <br /> <br />PAGE 02 <br /> <br />. .." <br /> <br />.. <br /> <br />:,"{t <br /> <br />1111 Chicago tv1etallic Corporation <br />o4&W s. AusIif1 AWnue. OtiaI&P. Illinois 60638-1492 <br />TEL 7061563-4600 FAX 708IS63-4551 <br /> <br />June 12, 1991 <br /> <br />Acoustical Concepts <br />P.O. Box 418 <br />Prior Lake, MN 55372 <br /> <br />Attn: Tom Keuler <br /> <br />Subject: Indirect Suspension of a Fire Rated Ceiling System <br />from an Existing Non-Fire Rated System <br /> <br />Dear Sir; <br /> <br />Recently, yo'l,1 voiced questions pertaining to the appropriate <br />method of suspending a Fire Rated ceiling system, hereafter <br />referred to as the exposed pl~nUDI ceiling- syst..., froln an <br />existing non-Fire Rated ceiling system, hereafter referred to as <br />the upper plenum ceiling system. The issue in question <br />primarily concerns the appropriate method of hanger wire <br />attachme~tto the existing ceiling. <br /> <br />Chicago Metallic has recommended that hanger wire placements for <br />the exposed ceiling system coincide with those for the upper <br />plenum ceiling system, i.e. hanger wire attachments to the upper <br /> <br />~enlUR :(ilin_~ ._ ~ ~j.1 ;. r-:\-~'"'' <br /> <br /> <br /> <br />In addition to the hanger wire placement procedures, Chicago <br />Metallic also has reco..ended that U.L. classified light <br />fixtures and air ducts are used, with appropriate fixture and <br />duct protection methods incorporated as recommended by U.L. <br />Laboratories. <br /> <br /> <br />I trust this letter will serve to answer your questions <br />pertaining to hanger wire support for an exposed ~eilin9 syst~ <br />from an upper plenum ceiling system. However, if further <br />questions arise, do not hesitate to contact Chicago Metallic. <br /> <br />cordi~ll , << <br />....~ <br />...'~ ~~ <br />Jim Staf ord <br />Asst. product Manager <br />Commercial Cei,ling Division <br /> <br />cc; RJK, TEF, VGA, ADI <br />