{"data":{"id":"us-nyc/n.y.c.-admin.-code-mc-313","jurisdiction":"us-nyc","citation":"N.Y.C. Admin. Code § MC 313","heading":"Section MC 313: Noise Control and Vibration Isolation Requirements","body":"313.1 General.\n\nInterior and exterior mechanical equipment and systems shall comply with the provisions of this section.\n\n313.2 Noise from exterior mechanical equipment.\n\nMechanical equipment located outside of the building in a yard or court or on a roof, or located inside a building but open to the exterior of the building, shall comply with the requirements of Sections 313.2.1 and 313.2.2.\n\n313.2.1 Design and installation.\n\nThe applicant shall select and design any such exterior mechanical equipment in order to achieve compliance with the applicable requirements of Sections 24-218, 24-227, 24-228 and 24-232 of the Administrative Code, also known as the New York City Noise Control Code, in accordance with generally acceptable engineering practices.\n\n313.2.2 Operation.\n\nThe operation of such exterior mechanical equipment shall comply with any applicable requirements of Sections 24-218, 24-227, 24-228 and 24-232 of the New York City Noise Control Code, as enforced by the Department of Environmental Protection.\n\n313.3 Minimum structure-borne noise and vibration isolation requirements.\n\nAll isolators shall comply with the requirements of Sections 313.3.1 through 313.3.10. Where vibration isolation of equipment and appliances is employed, supplemental restraint shall be used to accomplish the support and restraint.\n\nException: When specified by the registered design professional, the requirements of Sections 313.3.1 through 313.3.10 may be modified provided that the equipment, appliances, and supports shall be designed and installed so that continuous or intermittent vibration transmitted to structural slabs shall not exceed the following values between 8 Hz and 80 Hz on the structural slab in the affected occupancy space:\n\n1. Group E, I or R occupancies: 5,600 microinches (142.4 µm) per second.\n\n2. All other occupancies: 16,000 microinches (406.4 µm) per second.\n\nFor the purposes of this exception, transmitted vibration shall be in accordance with the following parameters:\n\n1. The peak third-octave band RMS velocity measurements.\n\n2. The method shall be in accordance with ANSI/ASA S2.71.\n\n313.3.1 Boiler rooms.\n\nBoilers, boiler breeching, and boiler piping shall be isolated in accordance with the applicable requirements of Sections 313.3.1.1 and 313.3.1.2.\n\n313.3.1.1 Boilers.\n\nAll boilers supported on floors directly above a story having dwelling units shall be supported on resilient isolators having a minimum static deflection of 1 inch (25.4 mm). The isolators shall be installed directly under the structural frame of the boiler.\n\n313.3.1.2 Boiler breeching and piping.\n\nWhen boilers are equipped with mechanical draft fans, the boiler breeching and piping that are supported from or on slabs, floors or walls that are contiguous to the dwelling unit shall be supported for a distance of 50 pipe diameters on or from resilient isolators. Each isolator shall have a minimum static deflection of 1 inch (25.4 mm).\n\n313.3.2 Refuse charging chutes.\n\nMetal chutes, chute supports, and chute bracing shall be installed in accordance with Section 313.3.2.1. Masonry chutes must comply with Section 313.3.2.2.\n\n313.3.2.1 Metal chutes.\n\nMetal chutes, metal chute supports, and/or metal chute bracing shall be free of direct contact with the shaft enclosure and the openings provided in the floor construction. Metal chutes shall be resiliently supported at each structural support location. Isolators shall provide a minimum static deflection of 0.30 inches (7.62 mm). All chutes shall be plumb.\n\n313.3.2.2 Masonry chutes.\n\nThe interior chute wall shall be plumb and without obstructions for the full height of the shaft and shall have a smooth interior finish.\n\n313.3.3 Piping.\n\nEquipment piping shall be installed as follows:\n\n1. Metal piping connected to power driven equipment shall be resiliently supported from or on the building structure for a distance of 50 pipe diameters from the power driven equipment. The resilient isolators shall have a minimum static deflection of 1 inch (25.4 mm) for all piping with a 4 inch (101.6 mm) or larger in actual outside diameter and 1/2 inch (12.7 mm) for piping with less than 4 inches (101.6 mm) in actual outside diameter. Piping connected to fluid pressure-reducing valves shall be resiliently isolated for a distance of 50 pipe diameters from pressure-reducing valves and isolators shall provide a minimum static deflection of 1/2 inch (12.7 mm).\n\n2. Equipment such as heat exchangers, absorption refrigeration machines, or similar equipment, that is located on any floor or roof other than a floor on grade, and that is not power driven but is connected by metal piping to power driven equipment, shall be resiliently supported from or on the building structure, for a distance of 50 pipe diameters from the power driven equipment. The resilient supports shall be vibration isolators having a minimum static deflection of 1 inch (25.4 mm) and shall incorporate approved resilient pads having a minimum thickness of 1/4 inch (6.4 mm).\n\n313.3.4 Fans.\n\nAll fan equipment with motors in excess of 1/2 horsepower (0.37 kW), located on any roof or floor other than a floor on grade shall be mounted on or from vibration isolators. Fan equipment with motor drives separated from the fan equipment shall be supported on an isolated integral rigid structural base supporting both the fan and motor. Fan equipment with motor drives supported from the fan equipment shall be mounted directly on vibration isolators. Each isolator shall have provision for leveling. Isolators shall incorporate resilient pads having a minimum thickness of 1/4 inch (6.4 mm). The vibration isolators shall provide a minimum isolation efficiency of 90 percent at fan rotor rpm with a maximum deflection of 2 inches (50.8 mm). Fans and compressors assembled in unitary containers may meet this requirement with isolators internal to the container providing the isolators meet the above minimum isolator efficiencies.\n\n313.3.5 Pumps.\n\nAll pumps of 3 horsepower (2.24 kW) or more located on any floor other than a floor on grade shall be supported on vibration isolators having a minimum isolation efficiency of 90 percent at the lowest disturbing frequency. Each isolator shall incorporate a leveling device and a resilient pad having a minimum thickness of 1/4 inch (6.4 mm).\n\n313.3.6 Compressors.\n\nCompressors and drives located on a floor other than a floor on grade shall be mounted on vibration isolators having a minimum isolation efficiency of 90 percent at the lowest disturbing frequency. Each isolator shall incorporate a leveling device and a resilient pad having a minimum thickness of 1/4 inch (6.4 mm).\n\n313.3.7 Cooling towers and fluid coolers.\n\nAll moving parts of cooling towers located on a roof or floor other than a floor on grade shall be installed on vibration isolators providing a minimum isolation efficiency of 90 percent at fan rotor rpm with a maximum static deflection of 4 inches (101.6 mm). Each isolator shall incorporate a leveling device and a resilient pad having a minimum thickness of 1/4 inch (6.4 mm). Vibration cutoff switches shall be provided.\n\n313.3.8 Evaporative condensers.\n\nEvaporative and air-cooled condensers located on a roof or floor other than a floor on grade shall be mounted on vibration isolators providing a minimum isolation efficiency of 90 percent at fan rotor rpm with a maximum static deflection of 4 inches (101.6 mm). Each isolator shall incorporate a leveling device and a resilient pad having a minimum thickness of 1/4 inch (6.4 mm). Vibration cutoff switches shall be provided on evaporative condensers.\n\n313.3.9 Duct connections to fans.\n\nFlexible connections shall be installed between fan equipment and connecting ductwork.\n\n313.3.10 Ceiling suspended packaged HVAC units with compressors.\n\nEquipment such as heat pumps, air-conditioning units, or similar equipment, that is suspended from a structure shall be resiliently supported from or on the building structure. Vibration isolators shall have a minimum isolation efficiency of 90 percent at the lowest disturbing frequency.","path":["New York City Administrative Code","Title 28","Chapter 8: New York City Mechanical Code"],"source_url":"https://files.amlegal.com/pdffiles/NewYorkCity/Admin/XML.zip","current_through":"Local Law 2026/135 (enacted August 31, 2026)","vintage":"","retrieved_at":"2026-09-06T02:48:57Z","sha256":"5a0ff03d63f899eb825a2bfe76bf3af9cf043fbad5794be878fd17d4cf449696","source_id":"us-nyc","stale":false,"prev":"us-nyc/n.y.c.-admin.-code-mc-312","next":"us-nyc/n.y.c.-admin.-code-mc-401"},"notice":"GroundRules: Original legal text. Not legal advice."}