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926.1.1 Exterior Mechanical Equipment

NYC Mechanical Code 2008 > 9 Specific Appliances, Fireplaces and Solid Fuel-Burning Equipment > 926 Noise Control Requirements > 926.1 Minimum Air-Borne Noise Insulation Requirements > 926.1.1 Exterior Mechanical Equipment

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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 LEVEL^a
(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

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 WATTS^a
MINIMUM DISTANCE FROM EQUIPMENT TO EXTERIOR WINDOW (ft.)^a	Octave Bands c.p.s. Mid Frequency
MINIMUM DISTANCE FROM EQUIPMENT TO EXTERIOR WINDOW (ft.)^a	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.

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:

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.
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.
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.

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