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be requested by the building inspector to indicate conformance with the <br />applicable noise reduction level requirements as specified in the Noise <br />Compatibility Tables. To assure the elimination of sound leaks, the plans <br />and specifications shall demonstrate compliance with the following <br />standards. <br />1. All mechanical ventilation systems shall be installed that will <br />provide the minimum air circulation and fresh -air supply requirements <br />as provided in the Uniform Building Code for the proposed occupancy <br />without the need to open any exterior doors or windows. <br />2. The perimeter of all exterior windows and door frames shall be sealed <br />airtight to the exterior -wall construction. <br />3. Fireplaces shall be equipped with well -fitted chimney cap devices. <br />4. All ventilation ducts, except range hoods, connecting interior space <br />to outdoors shall be provided with a bend such that no direct line of <br />sight exists from exterior to interior through the vent duct. <br />5. Doors and windows shall be constructed so that they are close - <br />fitting. Weather-stripping seals shall be incorporated to eliminate <br />all edge gaps. <br />6. All penetrations through exterior walls by pipes, ducts, conduits and <br />the like shall be caulked airtight to the exterior construction. <br />The building inspector may require that plans and specifications be <br />certified by a Recognized Acoustical Specialist for compliance with this <br />ordinance. <br />B. Within 30 days of receipt of appropriate plans and specifications, the <br />building inspector shall approve or reject the plans based upon the ability <br />of the proposed materials and construction techniques to adequately <br />attenuate noise. The building inspector shall approve the plans and <br />specifications if: <br />1. They adequately document the use of construction assembly that meet <br />or exceed the STC ratings required by the following table: <br />STC RATINGS REQUIRED FOR BUILDING ELEMENTS <br />SPECIFIED NOISE <br />LEVEL REDUCTION REQUIRED STC RATING NEED FOR COMPLIANCE* <br />dBA Roof -Ceiling Walls Windows Doors <br />20 40 40 30 20 <br />25 45 45 35 25 <br />30 50 50 40 30 <br />35 55 55 45 35 <br />40 60 60 50 40 <br />29 <br />