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www.dykeman.net 1716 Wesi Marine View Drive <br /> 425.259.3161 M 2nd Floor/Everett,WA 98201 <br /> Drew Martin, P.E., <br /> City of Everett Permit Services <br /> Re: River's Landing Fire Damage Repair B2211-013 <br /> Drew, <br /> We have reviewed the Mechanical plans prepared by Ventron, and find the modifications proposed to be <br /> acceptable. <br /> To comply with membrane penetration requiremements of the IBC,the contractor is proposing to construct <br /> 5-sided drywall boxes,to surround the fan assemblies. The fan assemblies will connect with minimum 26 <br /> gauge ductwork penetrations through the boxes_ Joist bays will be lined with taped drywall surrounding all <br /> duct runs. In the attic, duct penetrations through the drywall boxes will be sealed to the drywall box with fire <br /> rated caulk, such as LCI Spec Seal. Ducts in the attic space will be wrapped with 1'/z"high density mineral <br /> fiber insulation. This construction is acceptable, and has been approved by multiple jurisdictions, including <br /> the City of Seattle. We have included Seattle DCI memo describing this approved methodology, for <br /> reference. <br /> We believe this to be a code compliant solution in the spirit of the IBC, and IEBC. We also believe this <br /> solution to be a safer construction method than the unprotected ductwork and fan assemblies provided in <br /> the original construction. <br /> Whole house ventilaton will be provided to residential units at a rate of 55 CFM, with trickle vents through <br /> windows capable of providing a minimum of 10 CFM of relief air to all living spaces. These rates of <br /> ventilation comply with the 2015 mechanical code, and should exceed the UMC 1985 requirements which <br /> were in effect when the project was built. <br /> Please let us know if you have any further questions regarding this project <br /> W. Douglas Hofius, AIA. <br /> Dykeman Architects. <br /> V,/ <br /> FEB 27 N23 <br /> CITY OF -EVERETT <br /> permit Services <br />