NYC Noise Code Β§24-227 limits HVAC circulation device noise to 42 dB(A) inside receiving residences when ambient levels are at or below 42 dB(A). If ambient exceeds 42 dB(A), equipment may not add more than 4 dB(A) above ambient. Buildings with multiple HVAC units are limited to 45 dB(A) cumulatively.
NYC Administrative Code Β§24-227 regulates noise from circulation devices including HVAC systems, air conditioners, fans, and ventilation equipment. When the ambient sound level is at or below 42 dB(A), the sound from a single HVAC device may not exceed 42 dB(A) as measured inside the receiving residential unit. When ambient levels exceed 42 dB(A), the device may not add more than 4 dB(A) above the existing ambient level. Buildings with multiple HVAC units face a cumulative limit of 45 dB(A). Window air conditioning units are subject to the same standards. DEP enforces these limits through complaint-driven inspections using calibrated sound meters. Complaints are filed through NYC 311. Building owners are responsible for ensuring that rooftop and building-mounted HVAC equipment complies with the noise code. New HVAC installations require acoustic analysis as part of the DOB permit process. After-hours noise (10 PM to 7 AM) that exceeds 7 dB(A) above ambient at a receiving property is considered unreasonable under Β§24-218.
DEP noise violation summons. Fines start at $1,050 for first offense. Required mitigation with compliance deadline. ECB hearing for contested violations.
New York, NY
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