H36.REV

NOISE CONTROL

NOTE: FINAL COPY: JANUARY, 1987.

Part 1 -	GENERAL

1)	WORK INCLUDED

A.	Work in this Section includes the providing of labor, materials, equipment and services necessary for a complete and safe installation in accordance with the contract documents and all applicable codes and authorities having jurisdiction for the following

1.	Sound attenuating units.

2.	Sound-linings.

3.	Soundproofing of construction.

4.	External soundproofing.

2)	RELATED WORK AND REQUIREMENTS

A.	Requirements of GENERAL CONDITIONS, DIVISION NO.1 and Section GENERAL PROVISIONS FOR HEATING, VENTILATING AND AIR CONDITIONING WORK apply to all work in this Section

NOTE: EDIT TO SUIT PROJECT REQUIREMENTS. INCLUDE ONLY SECTIONS DIRECTLY AFFECTING WORK OF THIS SECTION

B.	Related work in the following Sections:

1.	FAN COIL SYSTEM.

2.	SHEET METAL WORK.

3.	AIR HANDLING SYSTEM EQUIPMENT.

4.	AIR DISTRIBUTION SYSTEM EQUIPMENT.

5.	VIBRATION ISOLATION.

6.	------.

3)	REFERENCE STANDARDS

A.	Published Specifications' standards, tests or recommended methods of trade, industry or governmental organizations apply to work in this Section

B.	Comply with all applicable national, state and local codes and refer to Section GENERAL PROVISIONS FOR HEATING, VENTILATING AND AIR CONDITIONING WORK for additional Reference Standards

4)	QUALITY ASSURANCE

A.	Acoustical Criteria:

1.	Noise levels due to equipment and ductwork shall permit attaining sound pressure levels in all 8 octave bands in occupied spaces conforming to NC-35 in all spaces, except the following

NOTE: ITEMIZE ALL SPECIAL AREAS WITH THEIR REQUIRED NC LEVELS. REFER TO ASHRAE GUIDE AND/OR ACOUSTICAL CONSULTANT FOR SPECIFIC AREA REQUIREMENTS

a.	-----: NC- -----.

B.	Mechanical performance:

1.	Air distribution system equipment, terminal device noise: The maximum permissible sound-power levels in octave bands of airborne transmissions through the combination of grilles, registers, diffusers and terminal units, or related pressure reducing devices, when operated in installed condition per plans and specifications, shall be as follows = = Maximum PWL (re 10 to the minus 12 Watts) = Octave Bands NC-30 NC-35 NC-40 NC-45 NC-50 = 1 60 62 66 68 70 = 2 53 56 60 63 66 = 3 45 49 54 58 62 = 4 41 46 51 56 61 = 5 38 43 48 53 58 = 6 37 42 47 52 57 = 7 36 41 46 51 56 = 8 37 42 47 52 57 =

2.	Pressure reducing boxes above ceiling; radiated noise: The maximum permissible radiated sound-power levels in octave bands, when operated in an installed condition over occupied spaces, shall be as follows = = Maximum PWL (re 10 to the minus 12 Watts) = Octave Bands NC-30 NC-35 NC-40 NC-45 NC-50 = 1 68 72 76 79 82 = 2 66 70 74 77 80 = 3 59 64 68 71 74 = 4 57 61 65 69 73 = 5 53 57 62 67 72 = 6 52 56 60 65 70 = 7 62 66 70 75 80 = 8 60 65 70 75 80 =

3.	Fan coil units: The maximum permissible sound power levels in octave bands for fan coil units shall be as follows = = Maximum PWL (re 10 to the minus 12 watts) = Octave Band NC-35 NC-40 NC-45 = 1 62 66 68 = 2 56 60 63 = 3 49 54 58 = 4 46 51 56 = 5 43 48 53 = 6 42 47 52 = 7 41 46 51 = 8 42 47 52 =

a.	Performance tests shall be in accordance with ASHRAE standard 79-1984 and ARI 440-84 and acoustic tests in accordance with ARI 350-82 with ratings tabulated for medium speed operation

4.	Acoustic performance within equipment spaces:

a.	Equipment room noise levels and noise transmissions to adjacent buildings shall comply with all federal, state and local nose ordinances

5.	Refrigeration machine gear train acoustical performance:

a.	The gear train assembly (between drive and compresser) when operating at the machine's rated capacity per plans and specif cations and tested in accordance with AGMA 295-02 shall have noise levels not exceeding 90 dBA

6.	Refrigeration machine acoustical performance:

a.	The maximum permissible noise levels under design operating conditions, when measured in accordance with ARI Standard 575-73 sp cified methods and qualifications shall not exceed 90 dBA

7.	Motor acoustical performance:

a.	Motor drives for pumps and refrigeration machines when installed per plans and specifications shall operate with noise levels not exceeding 90 dBA

b.	Noise levels shall be determined in accordance with IEEE Standard 85 test procedure fo airbone noise measurements on rotating electrical equipment

C.	Refer to Section GENERAL PROVISIONS FOR HEATING, VENTILATING AND AIR CONDITIONING WORK for guarantee and other Quality Assurance requirements

5)	SUBMITTALS

A.	Submit shop drawings and product data for the following:

1.	Sound attenuators, including certified test data.

2.	Soundlining.

3.	Certification that sound lining meets erosion test method described in UL Publication No. 181

4.	Nonhardening caulking.

Part 2 -	PRODUCTS

1)	BASE BID MANUFACTURERS

A.	Sound attenuators: Industrial Acoustics Co., Enviornmental Elements Corp., Korfund Dynamics Corp. and Aeroacoustic Corp

B.	Soundlinings: Certain-Teed Products Corp., Johns-Manville Corp. and Owens-Corning Fiberglas Corp

2)	SOUND ATTENUATORS AND SOUND LININGS

NOTE: SCHEDULE MAXIMUM ALLOWABLE PRESSURE DROP ON DRAWINGS.

A.	Sound attenuators shall be factory prefabricated with galvanized steel shell of a minimum No. 22 USSG and leakproof at a pressure differential of 8 inches wg

1.	Acoustic fill shall be glass or mineral fiber with a minimum density of 4.5 lbs per cubic foot packed under 5 percent compression. The flamespread shall be a maximum of 25 and the fuel contributed and smoke developed shall be a maximum of 30. The fill shall meet the erosion test method described in UL Publication No. 181. The filler shall be inert, vermin and moisture proof

2.	Provide minimum 24 gauge galvanized perforated steel baffles

3.	The net insertion ratings shall be determined by the duct-to-reverberant room test method at the design airflow = = Dynamic Net Insertion Loss (db) = Band Center Sound Trap Types = Frequency-Hz 3L 5L 7L 3ML 5ML 7ML = 125 5 7 13 5 8 12 = 250 9 13 18 10 15 20 = 500 14 21 28 17 28 36 = 1000 23 29 40 17 30 38 = 2000 24 39 47 13 21 28 = = Dynamic Net Insertion Loss (db) = Band Center Sound Trap Types = Frequency-Hz 3MS 5MS 7MS 3LFS 3S 5S 7S = 125 7 10 14 13 12 18 20 = 250 12 18 24 23 16 24 35 = 500 19 30 36 27 28 40 45 = 1000 23 42 48 26 35 45 50 = 2000 23 34 44 22 35 46 48 =

4.	The maximum self-generated noise at 2000 ft per minute face velocity shall be as follows = = Sound Power Level = db (re 10 to the minus 12 Watts) = Band Center Sound Trap Types = Frequency-Hz 3L 5L 7L 3ML 5ML 7ML = 125 51 52 = 250 51 46 = 500 49 43 = 1000 47 42 = 2000 50 45 = = Sound Power Level = db (re 10 to the minus 12 Watts) = Band Center Sound Trap Types = Frequency-Hz 3MS 5MS 7MS 3LFS 3S 5S 7S = (1500 FPM F.V.) (1000 FPM F.V.) = 125 54 42 49 = 250 52 45 49 = 500 50 43 47 = 1000 47 45 46 = 2000 48 49 49 =

5.	Submit certified test data from an approved laboratory for pressure drop and insertion loss ratings as follows

a.	For square or rectangular attenuators, provide 24 inches x 24 inches cross-section attenuator

b.	For round attenuators, provide 24 inches diameter conical attenuator

c.	Certification data for pressure drop and net insertion loss shall be based on tests of same attenuator

d.	Attenuators and tests shall be subject to inspection upon request

6.	Attenuators shall be similar to Industrial Acoustics, Inc

B.	Soundlinings shall be fibrous glass, minimum 1-1/2 lb per cu ft. Flamespread shall be a maximum of 25 and fuel contributed and smoke developed shall be a maximum of 30. Lining shall be suitable for a duct velocities up to 4000 fpm. Lining shall meet erosion test method described in UL Publication No. 181. The dynamic loss co-efficient shall be a maximum of 1.2. The K factor shall be a maximum of 0.25 Btu/hr/deg F/inch. The noise reduction coefficient for 1 inch thick lining shall be a minimum of 0.70

1.	The facing for low pressure duct liner shall have a neoprene coated finish and stenciled in accordance with NFPA 90.

2.	The facing for circular medium and high pressure duct liner shall be perforated, 28 percent minimum open area, and 24 gauge galvanized steel.

3.	In ductwork, provide a minimum thickness of 1 inch. In plenums, provide a minimum thickness of 2 inches. For soundlining used as thermal insulation, the minimum thickness shall conform to the requirements as specified in Section "INSULATION"

4.	The lining shall be similar to Johns-Manville Lina-Coustic

C.	Provide adhesive and sealer in conformance with NFPA 90A with ma specified in Section "INSULATION". Adhesive and sealer shall be similar to Benjamin Foster 85-20

D.	Nonhardening caulking shall be designed to be permanently elastic and shall be similar to Tremco Polybutene

Part 3 -	EXECUTION

1)	INSTALLATION

A.	Install sound attenuators in accordance with the manufacturer's recommendations to obtain noted performance. For maximum allowable static pressure loss, refer to tests in this Section allowable

B.	Adhere soundlinings with 6 inches wide strips of adhesive, 12 inches on centers and at joints in lining. In addition, secure with weld pins and 2 inch diameter washers on maximum 16 inch centers. Coat all edges with sealer. Provide continuous sheet metal edge protectors at entering and leaving edges of all lined duct sections and all joints. Dimensions of lined ductwork are clear inside dimensions after lining has been installed

NOTE: EXTENT OF SOUNDLININGS MUST BE SHOWN ON DRAWINGS.

1.	The extent of ductwork soundlinings for air-conditioning systems shall be as follows

a.	All supply ductwork within mechanical equipment rooms, but not less than a distance of 25 ft from each fan

b.	All return ductwork within mechanical equipment rooms, but not less than a distance of 20 ft from each fan

c.	In low-velocity ductwork at air distribution system equipment, provide soundlined boots at the return and exhaust registers connected to duct risers. Provide lining at other locations as noted on the drawings

NOTE: DELETE INAPPLICABLE SYSTEMS.

d.	In ventilation and exhaust systems, provide as indicated on the drawings

e.	In ductwork downstream of terminal units, provide a minimum of 10 ft or as per the manufacturer's recommendations. At air valves, provide a minimum 10 ft or as per manufacturer's recommendations

f.	The lengths shown are minimum. Provide additional acoustical treatment as required to meet maximum permissable sound-power levels scheduled for equipment

NOTE: LIST LOCATIONS OF SOUNDLINED PLENUMS AND IDENTIFY ON DRAWINGS

g.	Provide soundlined plenums as indicated on the drawings

C.	Soundproofing shall be installed in openings between ductwork and equipment room walls and floors, except in shafts and sound barrier ceilings. Fill openings with fibrous-glass blanket or board for full depth of penetration. Caulk each side of each opening with nonhardening, non-aging caulking compound similar to Johns-Manville "Duxeal"

NOTE: ITEMIZE ROOMS ABOVE WHICH DUCT WRAPPING IS REQUIRED.

D.	Ductwall external soundproofing shall be installed at the inlet and discharge transitions of vane-axial fans and their sound attenuators and elsewhere as indicated on the drawings

1.	Soundproofing material shall be 4 lb density fibrous glass board. The thickness shall be 1/2 inch greater than the height of the ductwork angles. The thickness shall be a minimum of 2 inches

a.	The external jacket shall be lead sheet, overlapped 2 inches and secured with tape. The weight shall be 1 lb per sq ft

2)	FIELD QUALITY CONTROL.

A.	Tests: After installation, measure the total system pressure before and after each attenuator. If the pressure loss at any attenuator exceeds the maximum static pressure scheduled on the drawings, replace the attenuator(s) at no charge, and/or modify entrance and/or discharge aerodynamic flow to obtain the specified performance