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2n THE AUSTIN <br />COMPANY <br />ARCHITECTS • ENGINEERS • BUILDERS <br />February 10, 1997 <br />Ms. Sharon Culbertson <br />BCAG Facilities - Everett <br />P.O. Box 3707 <br />Seattle, WA 98124 <br />Subject: Smoke Dampers in Duct Shafts <br />Reference: High Bay Factory Building <br />BCAG - Everett <br />Austin W.O. 96-5656D <br />Dear Ms. Culbertson: <br />000 SOUTHWEST IETH ST. <br />RENTON. WA SSOSS <br />PHONE: 200/220-0900 <br />TELEcoFlER. 206/220-5471 <br />221.01 AU SAIC42TTN2 <br />In the course of developing our contract documents, we found a code requirement in Section <br />713.10 (1994 UBC) for adding smoke dampers at dud penetrations in a vertical duct shaft within <br />the office areas. In lieu of smokeffire dampers, The Austin Company proposes to limit the <br />passage of smoke by using the supply and return air systems as an engineered smoke control <br />system. The system will operate as follows: <br />Smoke detected in either the supply or the return ductwork will cause the supply fan and <br />all of the fan -powered VAV boxes, associated with the supply fan, to stop. The return fan <br />dampers will go to the exhaust position and the return fan will go to full speed. <br />We believe that this system meets ali the requirements of the applicable code while eliminating <br />the need for combination smoke/fire dampers. The Austin Company is requesting that Bceing <br />forward this letter to the City of Everett Building Department to review our proposal and <br />determine if this is an acceptable alternative to the smoke dampers. It should be noted that the <br />last major addition of office areas were designed and built in 1992 without these smoke <br />dampers If you have any questions, please do not hesitate to call. <br />Very truly yours, <br />Stephen E. Lusk, AIA, P.E. <br />Manager of Engineering <br />