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® Stantec <br />To: Mr. Tony Lee <br />Building Official, City of Everett <br />From: Finn Jakobsen <br />Stantec <br />File:. Memo for COE Date: June 21, 2019 <br />Reference: PRMCE 9th Floor. Additional Requested Fire Dampers. <br />Memo <br />General Mechanical Svstem Overview: <br />The following is a brief system overview as approved by. City of Everett, Everett Fire Marshall, and Providence <br />Hospital during original D-wing tower design: <br />o Two air handling units serve the patient towers. Each air handling unit is equipped with a <br />supply air fan array and an exhaust air fan array. Each air handling unit serve all the patient <br />floors from level 5 up to the roof. <br />o All systems are 100% outside air (OSA) with heat recovery systems. No air is being <br />recirculated back into building. <br />o Air to individual rooms (and zones) are being controlled with terminal units on both the supply <br />air and on the exhaust air. This allows -pressure control of individual areas as needed by <br />building codes and. ASHRAE 170 standards. <br />Code Review: <br />o The hospital is an 1-2 occupancy which governs hospitals with patients that are "incapable of <br />self-preservation". <br />o Table 509 in IBC section 509 outlines requirements -for "Incidental Uses" in an 1-2 occupancy. <br />This includes the "clean/nourishment" rooms in question. Table 509 calls for the room to <br />have a 1-hour fire rating due to its size. <br />o Code section 717.5.2 governs "Fire Barriers" and requires a fire damper be installed in <br />ductwork penetrating the barrier with the flowing exceptions: <br />■ Ducts are used as part of an approved smoke control system in accordance with <br />Section 909 and where the use of a fire damper would interfere with the operation of <br />a smoke control system: <br />■ Such walls are penetrated by ducted HVAC systems, have a fire rating of 1 hour or <br />less, are in areas other than Group H, and are in building equipped with an automatic <br />sprinkler system in accordance with Section 903.3.1.1 or 903.3.1.2. For the <br />purposes of this exception, a ducted HVAC system shall be a duct system for <br />conveying supply, return or exhaust air as part of the structure's HVAC system. Such <br />a duct system shall be constructed of sheet metal not less than No. 26 gage <br />thickness and shall be continuous from the air -handling appliance or equipment to <br />the air outlet and inlet terminals. <br />Design with community in mind <br /># 020481active120482043ftoe review commentslmemo for coe.docx <br />I/S <br />