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. � . <br /> RESUBMITT^' ZESPONSE LETTER: Builders Investment Group New Building —Mechanical <br /> Page 2 <br /> Respor.se: Building and mechanical design was reviewed together�Hith Gaffney <br /> Construction and Tony Finsland. It was determined that wails surrounding the <br /> Core (Lobby, Hall, Utility Room and ResVooms) on each floor are rated such that <br /> ducts �an pass through without fre-smoke dampers. Ducts from rooftop unit <br /> RTU-7 which pass from ceiling of 3'"floor through 3`° and 2n° floors down tc <br /> ceiling of 181 floor will require a one-hour rated chase from 3'"floor ceiiing to top <br /> of floor between 1°`and 2nd floors. A fire-smoke damper is require�!where each <br /> main duct enters at top of chase, and where they exit at bottom of�:hase, and <br /> in addition wherever a duct branch exits the chase. Restroom exhaust ducts <br /> need no fire-smoke or fire dampers. Please refer to Tony Finsiand for a detailed <br /> explanatio� of why the Core walls do not need to be rated. <br /> Two pages from 2001 Fire Resistance Directory and six pages fi•om <br /> Gypsum Constructior. Handbook given me by Gaffney Constructiori show <br /> options for rated chase construction. Please let me know if this fulfi►Is require- <br /> ments. <br /> 3. The support of the seven new rooftop units requires review and stamped structural verification <br /> by a Washington State licensed professional engineer. If required, modifications to the struc- <br /> tural roof framing should also be submitted and wet-stamped by the engineer. For reference, <br /> the number and weights of the rooftop units (RTU) shown on the structural roof framing plan <br /> should coincide with the rooftop unit schedule on sheet M-3. <br /> Response: CanAm drawing JE3 of 5 attached with original submittal shows all roof <br /> trusses,joists and girders and in addition location of each rocftop unit with <br /> weight shown. Selected portions of CanAms structural calculations for each <br /> truss,joist and girder affected by one or more rooftop unit are attached. Cover <br /> page for calculations carries wet stamp of CanAm's structural engineer. The <br /> following rooftop units affect the following structural members: <br /> RTU-1: TJ55 and J55. <br /> RTU-2: J39 and J56. <br /> RTU-3: J59 and TJ51. <br /> RTU-4: J35 and J54. <br /> RTU-5: TJ49 and J49. <br /> RTU-6: TJ49 and J49. <br /> RTU-7: J43, TJ44 and G26. <br /> Sheet M-4 rooftop unit numbers were corrected to properly ceincide with <br /> schedule on sheet M-3. <br /> 4. Economizers either are required unless documentation is provided that demonstrates that <br /> economizers are not required, per WSEC table 11-1, or per WSEC section 1423 economizers. <br /> RTU-1, -3, -4 and -6 do not have economizer note referenced on the rooftop unit schedule on <br /> sheet M-3. <br /> Response: All rooftop units will have economizer and schedule was updated to <br /> include economizer infa for all units. <br /> Thanks, <br /> Bengt /��( <br /> Bengt-Olov Nordensson/SVVEDE HVAC, Inc. <br /> Celi: 425.508.8984 <br /> E-ma�l: swedehvac@hotmail.com � <br /> �/� / <br /> �� <br /> � <br />