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The mechanical drawings (sheet M1 has been revised to specify finless steel backing9 ) P fY s <br /> (non- <br /> absorbent material) extending a minimum of 18"in all directions beyond the nearest edge of the <br /> new installed hood. <br /> 4. The building section on Sheet M-1 includes a note for the exhaust duct stating "Fire wrap <br /> terminates at the end of curb. Remaining duct on roof will stay 18" away from combustibles". <br /> The wrap should continue along the duct if the curb is combustible. In addition, the section <br /> should specify a minimum 18-inch clearance to be maintained between the duct and the roof. A <br /> detail clarifying the duct penetration through the roof and the"curb"should be included. See IBC <br /> Section 107.2.1 and IMC Section 506.3.6. <br /> The curb is constructed of non-combustible material. The curb material is 14-gauge galvanized <br /> steel. This is now specified on sheet M1 of the revised plans. Thus, the fire wrap should only need <br /> to extend to the end of the non-combustible curb, standing 20"tall off the nearest edge of the <br /> existing roof. Additionally, a new section detail (A) has been added. The 18-inch minimum <br /> clearance between the duct and the roof is now specified in this detail and the revised plans on <br /> M1. <br /> Thanks for taking the time to review revised plans and attached response letter. <br /> Sincerely, <br /> Austin Rapp, B.S. M.E David Bradley, P.E. <br /> Ph. (360) 325-2515 Ph. (360) 752-5795 <br />