Laserfiche WebLink
• 410 <br /> Ms. Callie Alexander <br /> New Hewitt/Hodges, LLC <br /> Plan Check Number: M1901-003, First Building Review <br /> January 16, 2019 <br /> 1. The ducts for the exhaust fans penetrate the floor assemblies throughout the building. The <br /> keynotes specify that the ducts shall be installed without fire dampers per IBC Section <br /> 717.6.1 Exceptions 1 through 5. The exception requirements shall be listed in the keynotes <br /> similar to the requirements for wall penetrations. See Keynote 4/M2.02 as an example. See <br /> IBC Section 107.2.1. <br /> 2. The project includes 4-inch ducts penetrating through dwelling walls at multiple locations <br /> throughout the building. Several locations are being installed per IBC Section 717.5.4 <br /> Exception 3. See Keynote 4 on Sheet M2.02 for an example. See IBC Section 420.2. The <br /> duct penetration at the following additional locations shall include keynotes specify similar <br /> construction: <br /> a. Sheet M2.01: EF-1A and WH-1 ducts through all walls. <br /> b. Sheet M2.02: EF-1B and EF-1B ducts through shaft (i.e., chase) walls. <br /> 3. The EF-1B and EF-1C ducts on Sheet M2.02 pass down through the floor assembly to the <br /> First story. The duct penetration through the floor shall be constructed per IBC Section <br /> 717.6.1. <br /> 4. The ducts serving exhaust fans on Sheets M2.03 through M2.05 are required to be <br /> concealed in walls per IBC Section 717.6.1 Exception 1, as stated in Keynote 2. However, <br /> the keynote is only specified where each duct originates. The keynote is not specified for <br /> the ducts passing through the Fourth and Fifth stories on Sheets M2.04 and M2.05, <br /> respectively. The plans do not appear to show walls at the duct locations. The drawings <br /> should be revised to clarify how this requirement will be satisfied. See IBC Section 107.2.1. <br /> 5. The following comments should be addressed for the EF-1D and EF-1E ducts, and dryer <br /> ducts EH-2A through EH-2D, on Sheet M2.02: <br /> a. The ducts should be concealed in soffits per Keynote 1. See IBC Section 107.2.1. <br /> b. The ducts are closely-spaced and penetrating through a structural wall. It appears the <br /> wall may be constructed of unreinforced masonry. A detail for the penetrations, <br /> including but not limited to spacing requirements, opening edge distanced, and notes to <br /> avoid cutting steel reinforcement where present, shall be included in the drawings. <br /> Structural calculations may be required to substantiating that the penetrations do not <br /> impair the load-carrying capacity of the wall. See IBC Sections 107.2.1 and IEBC <br /> Sections 807.4 and 807.5. <br /> c. The ducts on Sheet M2.01 appear to penetrate the west exterior wall at an existing <br /> window opening. The construction of the penetrations should be clarified. A detail <br /> should be included as needed. If the penetrations occur through the existing structural <br /> systems, additional detailing and calculations may be required. See IBC Sections <br /> 107.2.1 and IEBC Sections 807.4 and 807.5. <br /> 6. Sheet M2.01 shows the water heater and exhaust fan vents in close proximity to each other. <br /> See IMC 501.3. The code references or manufacturer's specifications shall be submitted <br /> substantiating the required duct clearances. The following comments shall be addressed: <br /> a. The minimum spacing of the water heater vents shall be specified. <br /> b. The minimum height above the adjacent grade shall be specified. <br /> c. The minimum clearance to the adjacent exhaust fan vents shall be specified. <br /> 0 3200 Cedar Street 0 425.257.8800 0 everettpw@everettwa.gov <br /> Everett, WA 98201 425.257.8882 fax everettwa.gov <br />