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S. Building Shell Controls <br /> The following additional precautionary measures are required to assure the greatest <br /> potential for exterior-to-interior noise attenuation by the recommended mitigation <br /> measures. These measures apply at those units where closed windows are required: <br /> • Unshielded entry doors haeing a direct or side orientation toward <br /> the primary noise source must be 1-5/8" or 1-3/4" thick, insulated <br /> metal or solid-core wood construction with effective weather seals <br /> around the full perimeter. Mail slots should not he used in these <br /> doors or in the wall of a living space_ as a significant noise leakage <br /> can occur through them. <br /> • If any penetrations in the building shell are required for vents. <br /> piping. conduit. etc.. sound leakage around these penetrations can <br /> be controlled by sealing all cracks and clearance spaces with a non- <br /> hardening caulking compound. <br /> • Fireplaces should be provided with tight-fitting dampers. <br /> B-5 <br />