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926.1.1 Exterior Mechanical Equipment
Mechanical equipment in a building in any occupancy group, when located outside of the building in a yard or court or on a roof, or where the equipment opens to the exterior of the building, shall be subject to the noise output limitations given in Table 926.1 where one or more windows of a dwelling unit in any building in occupancy groups R-1, R-2, and R-3, are located within a sphere of 100 foot radius (30 480 mm) whose center is any part of the equipment or its housing, unless it can be shown that the sound pressure levels, in octave bands, of the exterior mechanical equipment as measured within the dwelling unit do not exceed the levels given in Table 926.1(2).

TABLE 926.1 (2)
NOISE OUTPUT LIMITATIONS FOR EXTERIOR MECHANICAL
EQUIPMENT MAXIMUM SOUND PRESSURE LEVELa
(NOT TO BE EXCEEDED IN ANY OCTAVE BANDS)
OCTAVE BANDS
CENTER FREQUENCY (cps)
DECIBELS
RE .0002 MICROBAR
63 61
125 53
250 46
500 40
1000 36
2000 34
4000 33
8000 32
  1. Measurements shall be obtained with a sound level meter and octave band analyzer, calibrated both electronically and acoustically before and after the measurements are made.


TABLE 926.1 (1)
MAXIMUM SOUND POWER LEVELS PERMITTED FOR EXTERIOR MECHANICAL EQUIPMENT ADJOINING BUILDINGS
MAXIMUM SOUND POWER LEVELS IN OCTAVE BANDS — db re 10-13 WATTSa
MINIMUM DISTANCE FROM
EQUIPMENT TO EXTERIOR
WINDOW (ft.)a
Octave Bands c.p.s. Mid Frequency
63 125 250 500 1000 2000 4000 8000
12 97 90 83 78 75 73 72 71
25 104 96 89 84 81 79 78 77
50 110 102 95 90 87 85 84 83
100 116 108 101 96 93 91 90 89
Octave Bands-db re 10-12 Watts
12 87 80 73 68 65 63 62 61
25 94 86 79 74 71 69 68 67
50 100 92 85 80 77 75 74 73
100 106 98 91 86 83 81 80 79
For SI: 1 foot = 304.8 mm.
  1. The minimum distance shall be measured in a straight line regardless of obstructions. Interpolated levels may be used for distances between those given in this table. See note (a) at end of Table 1207.2.1 in the New York City Building Code.
Notes:
  1. In the event sound power level data for the exterior mechanical equipment is not available, the sound pressure levels, in octave bands, of the exterior mechanical equipment shall be measured.
  2. The measurements shall be obtained with the microphone of the measuring equipment located at the interior of the dwelling unit affected in a line with the window nearest the exterior mechanical equipment. The window shall be fully open and the microphone shall be located 3 feet away from the open portion of the window.
  3. Measurements shall be obtained during times when the ambient sound pressure levels, in octave bands, are at least 6db lower at all octave bands than the sound pressure levels measured with the exterior equipment operating. By ambient sound pressure levels is meant the measured sound pressure levels, at the above described measuring location, with the exterior equipment not in operation.
926.1.2 Noise Control Code
Sound sources shall also comply with any applicable requirements of Section 24-232 of the Administrative Code, also known as the New York City Noise Control Code.

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