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GALLOWAY ACOUSTICS ENGINEERING SERVICES LLC

Manufacturing Noise Control Solutions

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Acoustic Louvres

Galloway Acoustics was originally established in 1994 as Attenumate, in the United Kingdom. The division thus, began operating as an autonomous part of the Group, providing noise control products and acoustic consultancy to the Acoustics market.

A distinguished acoustic solutions provider, Galloway Acoustics, offers a comprehensive range of products and solutions focused on the transfer of knowledge, technology and proprietary manufacturing processes with sheet metal fabricators in the HVAC and associated industrial industries. Our team of highly qualified and experienced acoustic engineers, consultants and trainers have mastered the art of manufacturing an array of quality acoustic products, including silencers/attenuators, industrial silencers, louvres, enclosures and screens.Galloway’s online software tool, G-select Pro, is designed to provide the most seamless buyer experience. The web tool enables an easy selection of noise-control products and provides options to schedule appointments with our service professionals.

In 2017, Galloway Acoustics was taken over by Oasis Investment Company, fortifying the latter's presence around the globe. Galloway Acoustics is now a registered brand with Galloway Acoustics Engineering Services LLC, UAE, and continues to execute iconic projects in the Healthcare, Datacentre, Aviation, Hospitality, Entertainment, Sports, Commercial and Retail sectors. Galloway Acoustics' global presence includes an extensive network of licensee partners in Australia, the United States of America, UAE and Qatar, as well as numerous channel partners in Asia.

Since then Galloway Acoustics Engineering Services LLC has been active in ‘Selling the Science’ via a comprehensive manufacturing programme including full training and technical support allowing companies to enter into a manufacturing licence programme. The programme which enables the licensee to manufacture and sell the products in an exclusive geographical market area.

We have bona fide experience in the creation, development and growth of acoustic companies and divisions. Our senior management team is both technically and commercially competent. At Galloway Acoustics Engineering Services, we are committed to sharing our expertise with compatible businesses in the common interest of providing an ambient environment with superior acoustic performance.

ABOUTGALLOWAYACOUSTICS

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Galloway Acoustics' standard rectangular silencers are manufactured from pre-galvanised steel sheets and constructed in accordance with DW 144 and as per the construction specification shown in the table below. The longitudinal joints are grooved/pittsuburg seam filled with mastic sealant. Due to the splitter casing being riveted to the main attenuator case creating an inherently stiff component, intermediate stiffeners are only used on attenuator lengths over 1800 mm as required. The silencers are available with stainless steel and aluminium casings, MS and with corrosive coating for Marine applications.

RECTANGULARSILENCERCONSTRUCTION

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UKAS ACCREDICTEDTEST RIGUKAS Accredited test rig to BS EN ISO7235:2009 at Sound research laboratories - UK used for the testing of Galloway Acoustics silencers. This test rig was designed manufactured and installed by Galloway Acoustics.

The tests for acoustic louvers and acoustic panels were carried out at Salford University to a UKAS accredited standard and in accordance with BS EN ISO 140-33 1995.

Upto 1000 mm - 0.80 mm

CASING THICKNESS* END FLANGES*

(up to +1000 PA, Pressure Class)

As per DW144 Class A/B

1001 to 2500 mm - 1.00 mm

2501 to 3000 mm - 1.20 mm

Upto 800 mm - 20/25 mm slip on flanges

801 to 1600 mm - 30/35 mm slip on flanges

1601 to 3000 mm - 40/45 mm slip on flanges

Upto 1000 mm - 0.8 mm

CASING THICKNESS* END FLANGES*

(upto +2000 PA, Pressure Class)

As per DW144 Class C

1001 to 1600 mm - 1.00 mm

1601 to 2500 mm - 1.20 mm

Upto 600 mm - 20/25 mm Slip on flanges

601 to 1250 mm - 30/35 mm Slip on flanges

1251 to 2500 mm - 40/45 mm Slip on flanges

ACOUSTICSPLITTERS

Galloway attenuators have aerodynamically shaped bullnose fairings on the front and back of the splitters for a reduced pressure drop. The baffles have rockwool infill material of 45 kg/cu.m density a minimum installed compression rating of 5% and a retained 22G thick expanded metal/perforated sheet facing to avoid erosion of fibres at high velocities. The infill material with a black glass tissue facing is inert, non-combustible, non-hygroscopic, vermin proof, rot-proof and does not support bacterial growth.

Availabe Models:

Galloway Acoustics currently has 55 different silencer configurations, A1 to A55, with a melinex equivalent, A1M to A55M for each type. The silencers are available in a standard length of 600, 900, 1200, 1500, 1800, 2100 , 2400 2700 & 3000 mm.

Refer to Fig-1 on page no.25 for sample data sheet.

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6

Royal Opera House Muscat

APPLICATIONS

Studios and AuditoriumsResidential BuildingsCooling Towers and ChillersGenerator RoomsAirportsHealthcarePublic Buildings like Mosques, Theaters, LibrariesMuseumsResorts & HotelsDatacentres

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PRODUCT RANGE

Rectangular silencers of galvanised, stainless steel, aluminum construction (Class A, B & C)Circular silencers of galvanised, stainless steel, aluminium construction.Fire-rated construction requirements of BS 476 part 4 (Fire) and BS 5588 Part A (Smokesilencers with Melinex lining or Galloway's fibre free insulation over the infill material which is suitable for kitchen ducts, clean room applications and where hygiene is of utmost importance.High-temperature casing silencers suitable for smoke extract ductwork systems, tested to BS 476 part 24:1987 for2 hrs fire rating for temperatures up to 300 degree celcius by Warringtonfire Exova-UK. The silencers do not require any additional fire coating.Multi-section silencers for any width or heightVertical Bend, Horizontal Bend, T-section, Z-Section silencersCrosstalk attenuatorsAcoustics, Non-Acoustics louvers and Sand Trap LouvreAcoustic Screens and Enclosures.

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Dependent on quantity and specifications, cylindrical attenuators are constructed from pre-galvanised sheet steel either as an overlapped longitudinal seam or spiral wound with casing and leakage being a minimum of DW144.

The silencers are also available in stainless steel and aluminium casings.

Availabe Models:-

CA/CPA – SPG The addition of SPG on the code denotes the use of spigot connections in preference to the internal flanges or nut inserttype.

CAXT 1 & 2 SILENCERS/CROSSTALK

The units are manufactured with spigot connections on each end to fit into most standard ISO duct systems. Their main purpose is to provide high levels of cross talk privacy between adjacent rooms served by a common ductwork system, whilst producing a negligible additional pressure loss on the system.

CYLINDRICAL SILENCERCONSTRUCTION

Different people have varying degrees of tolerance to noise.

Galloway's silencer selection is based on customised requirements and is tailored taking into consideration the required applications and permissible levels of noise. The NR (Noise Rating) and NC (Noise Criteria) levels sound curves can be used as a guide to estimate the optimal indoor environment for hearing, communication and noise annoyance.

SILENCER SELECTIONS

NR AND NCCRITERIA FOR VARIOUS APPLICATIONS

Concert Hall, Theatre

AREAS SERVED NR/NC INDEX

Lecture Theatre, Cinema

Guest Bedrooms

Offices

Ballroom, Banquet Room

Corridor, Lobby

Councourses

Kitchen, Laundry

Restaurants

Workshops

Car Park

20 - 25

25 - 30

30

30 - 35

30 - 35

35 - 40

40 - 45

40 - 45

40 - 45

45 - 50

50 - 55

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FFC FIRE-RATED SOUND ATTENUATOR

The FFC Fire-Rated Attenuators with 250 FFC coating are tested to BS476 Part 24 for 120 minutes against the fire fire stability, integrity and insulation criteria and suitable for temperatures as per the cellulosic curveators.

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Refer Fig-3 on page no.25

(COATED)

The Flame Safe fire-rated sound attenuator system with high temperature casing is suitable for use in smoke extract ductwork systems carring smoke and hot gases up to a duration of 120 minutes for the stabitility and integrity criteria as per BS476 - Part 24 1987.

The sound attenuators hold the Exova Warrington certification.

The sound attenuators do not require any additional fire coating.

FLAME SAFEFIRE-RATED SOUND ATTENUATORS(NON-COATED) UAE Civil Defense approved

STRAIGHT SILENCER

FIG-1

FIG-3

FIG-2

FIG-4

FIG-5 FIG-6

C

OVERALL LENGTHA

B

BOVERALL LENGTH

A

MULTISECTION

C

C

E

D

D

HORIZONTALBLEND

F

C

AIR FLOW

A

HBJ F

G

A = 1/2(B+K) + H + JB = K (UNLESS ADVISED)MINIMUM H & J = 150MM

CG

H

E

B

AIR FLOWAJ

D

T - SECTION

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STANDARDDRAWINGS

ACOUSTIC &NON-ACOUSTIC LOUVRES

Galloway Acoustics has designed a range of acoustic and non-acoustic louvers to accommodate all potential applications.

All the acoustic options have been tested at Aalford University to comply with UKAS accreditation standards.

Acoustic single leaf or double leaf louvered doors can be manufactured from either the 150mm or 300mm deep design but in both cases due to practical space and weight restrictions, these are only offered as a single bank option.

Alternatively, a non-acoustic louvered door can be offered with a back blanking plate to match louvre banks that require the acoustic performance of a double bank design.

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ACOUSTIC DESIGN

Noise Reduction-defined as used to define the performance of a noise barrier. Established by measuring the difference in sound pressure levels adjacent to eachsurface.

The acoustic performance figures for our standard range of acoustics louvres are based on sound insulation (Sound Reduction) accredited test as per BS EN 140-3.

Sound Reduction Index - Defined as a set of values measured by a specific test method to establish the actual amount of sound that will be stopped by the material, partition or panel when located between two rooms.

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L-AS-150

L-AD-150

L-AS-300

L-AD-300

dB

dB

dB

dB

5

6

6

8

5

7

6

10

6

9

7

11

7

14

12

20

13

22

19

27

13

19

19

27

13

19

17

26

12

18

16

25

Model Fr 63 125 250 500 1k 2k 4k 8k

L-AS-150

L-AD-150

L-AS-300

L-AD-300

dB

dB

dB

dB

11

12

12

14

11

13

12

16

12

15

13

17

13

20

18

26

19

28

25

33

19

25

25

33

19

25

23

29

18

24

22

28

Model Fr 63 125 250 500 1k 2k 4k 8k

Sound Reduction Index

Noise Reduction Index

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Emerald Palace, Kempinski Hotel, Dubai

LOUVRE TYPES

FIG A - Standard 150/300 Deep Acoustics Louvre (and complimentry non-acoustic louvre)

150150 304

3131

Heigh

t ‘Y’

150m

mpit

ch

PF

BGBP

MF

L-AS-150 L-AD-150L-NA-150

Width ‘X’Louvre = X-15mm

Louv

re =

Y-15

mm

FIG B - Standard 300/600 Deep Acoustics Louvre (and complimentry non-acoustic louvre)

Width ‘X’Louvre = X-15mm

Louv

re =

Y-15

mm

Heigh

t ‘Y’

150m

mpit

ch

300150PF

BGBP

MF604

L-AS-300 L-AD-300L-NA-150

31

31

15

BWO

C / O60°

C / O = BWO - 294mm (single)C / O = BWO - 514mm (double)

FIG C - Acoustic and Non-Acoustic Louvre Doors

Louvre doors available is Single or Double leafBG-Optional bird guard to rear of doorBP-Optional blanking plate fitted to rear of door

Clea

r Ope

ning

Build

ersw

ork O

penin

g

Front Elevation LD-AS-150LD-NA-150

LD-AS-300

BPBG

FIG E – Louvre Screen/EnclosureProduct code `NS´. Please consult Technical Sales to assist with the design.

Optionalbirdscreen

Optionallouvredcorner

Concrete plinthby others

Structural steelcorner post

For Penthouse louvredesigns please specifyoverall outsidedimensions, active louvresand louvre type required

Optional roof to createPenthouse louvreconstruction.Product Code ‘PEHO’

Masonaryfixings

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FIG D - Multi Section Louvre Assembly MSW/MSH

The standard maximum single unit dimensions are 2400mm wide x 1800mm high for either the 150 or 300 depth design. The units above these dimensions will be manufactured as multi-sections on the width (MSW) or height (MSH). For larger louvre banks, the unit can be both MSW and MSH. Individual louvre sections are bolted together, through the side panels, using m8 fixing and secured to the structure, also via the side panels, using fixings suitable to the structural surround. The required bottom sections are strengthened to support the weight of the top units.

A

A-T

A-B

B-T

B-B

ACOUSTIC ENCLOSURES & SCREENS

Galloway Acoustics' enclosures/screen systems are based on five standard panel designs, coded 1 to 5, type 1 being of the lowest acoustics performance and type 5 the highest. The differences between panel 1 and 5 are created by the application of varying infill components into the standard panel thickness.

The panel types 1 to 5 can be incorporated into three construction systems for different applications.

H-FrameA cost-effective industrial enclosure/screen system a with versatile number of panel connection methods.

PentapostA High acoustic performance system with a quality aesthetic appearance. Used primarily for an enclosure/screen system that requires architecturally pleasing details (fixing can be hidden) coupled with good acoustic performance.

Frameless/Site Assembly SystemThe primary application for this system is internal construction, which requires differing aesthetic finishes applied to the internal/exposed panel face such as audiology rooms, recording studio, music practice rooms, and permanent room partitions. Other applications include large industries such as automotive spray paint booths.

GeneralThe acoustic performance of both the H-Frame and Pentapost designs have been tested using a 75mm thick panel for all five panel types. The frameless/site assembly system was tested using a 100mm thick panel, across all five panel types. In our opinion and as indicated during these tests, the difference in panel performance for the same panel type from 75 to 100mm is marginal and as such performance figure for 75mm panel can be used where a 50mm panel thickness is required.

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Complete Solutions for Generator Room Acoustics at Muscat International Airport

Acoustic Louvers

Non-Acoustic Louver Doors Sound Attenuator

Acoustic Enclosures (Outside View)

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UKAS CERTIFICATION

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Table 1 Octave Band Static (0m/s) Insertion Loss to BS4718 1971Test method BS 4718 1971 does not define or require the testing of dynamic insertion loss. ISO 7235 1996 defines dynamicinsertion loss but does not class testing of this as compulsory. Both standards require the testing of static insertion loss, inletand outlet flow generated air noise and silencer pressure loss due to airflow.

Insertion Loss dBModel Lengthmm

Face Velocity andCondition 63Hz 125Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz 8000 Hz

A39 600 0m/s STATIC 8 13 22 24 24 23 18 17

A39 900 0m/s STATIC 10 17 30 36 38 36 24 20

A39 1250 0m/s STATIC 11 21 39 48 52 49 30 24

A39 1500 0m/s STATIC 13 24 46 54 60 58 36 28

A39 1800 0m/s STATIC 15 28 52 60 65 66 40 31

A39 2100 0m/s STATIC 16 32 52 60 65 68 47 34

A39 2400 0m/s STATIC 17 36 52 60 65 70 53 38

GALLOWAYACOUSTICS

ATTENUMATERECTANGULARSILENCERSMODEL A39DATA SHEET

• Meets major mechanicalservice constructionspecifications

• Leakage DW 144Class A/B standardClass C Optional

• Ductmate flanges asstandardOther types optional

• Advanced design withasymmetric splitters

• Higher acousticperformance

• Reduced pressure loss

• Aerodynamic bull-nosedsplitters to inlet and outlet

• High performanceRockwool acoustic splitterinfill with glass tissue face

• Expanded metal splitterfacing as standard

• Pre-galvanised sheet steelcasing

• Computer aided selectionfor optimum sizing

• Quality Assurance inaccordance with ISO 9002

• Independently tested inaccordance with BS 47181971 and ISO 7235 1996on a UKAS accredited testrig

B

C

Table 2 Self Generated NoiseINLET k face

OCTAVE SWL PER SQUARE METRE OF FACE AREAdB

Type Duct toDuct

Plenumto Duct

Duct toPlenum

Plenum toPlenum

FACEVELOCITY

(m/s) 63 125 250 500 1000 2000 4000 8000108642

36.735.234.832.428.5

40.137.833.631.424.5

38.737.336.635.227.1

48.245.241.139.324.8

55.850.946.037.319.2

53.248.141.831.716.5

32.030.929.426.315.6

29.528.227.223.715.2

OUTLETOCTAVE SWL PER SQUARE METRE OF FACE AREA

dBFACE

VELOCITY(m/s) 63 125 250 500 1000 2000 4000 8000

600

900

1250

1500

1800

2100

2400

10.18

11.11

12.05

13.19

14.33

15.47

16.61

11.19

12.22

13.25

14.51

15.77

17.02

18.27

16.02

17.17

18.30

19.72

21.11

22.48

23.82

16.61

18.14

19.67

21.54

23.40

25.27

27.12

108642

56.549.239.231.430.8

52.846.439.734.325.6

55.150.144.238.029.6

58.152.947.240.030.9

58.953.747.139.928.0

58.452.745.136.221.6

56.249.741.127.520.0

50.543.633.223.718.0

Correction for face area, 10 log10 (Area)Area 0.5 1 2 4 8 16 m²

Correction -3 0 +3 +6 +9 +12 dB

Silencer pressure loss:ΔΔΔΔp = V (FACE) 2 x 0.6 x k

Table 3 Pressure Loss

Fig-2

Fig-3

Fig-1

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Sample Calculation & Data Sheet

ENGINEERS CALCULATIONSHEET

(Room)Paternoster House,65 St.

Pauls Churchyard, London, United Kingdom

Project Details

Project Reference Sample-1572-1 EN Date 18/8/2021

Selec�on Equipment SWL(dB)

Fan Details Room/Area Served Fan Duty (m /s) 63 Hz 125 Hz 250 Hz 500 Hz 1 KHz 2 KHz 4 KHz 8 KHz

Sample BED ROOM 2.5 80 80 75 73 68 65 62 55

Duct A�enua�on

Duct Type Length(m)/No Dimension(mm) 63 Hz 125 Hz 250 Hz 500 Hz 1KHz 2 KHz 4 KHz 8 KHz

Rectangular 2 800 2 1 1 0 0 0 0 0

Rectangular 2 800 2 1 1 0 0 0 0 0

Radius Bend 1 800 0 0 1 2 3 3 3 3

Rectangular 5 600 4 3 2 1 1 1 1 1

Rectangular 5 600 4 3 2 1 1 1 1 1

A�enua�ons

Type 63 Hz 125 Hz 250 Hz 500 Hz 1 KHz 2 KHz 4 KHz 8 KHz

End Reflec�on LossGrill Size: 225 mm X 225 mm =

0.05Grill

Loca�on:Flushm 13 9 4 2 0 0 0 0

Sound Power Leaving 55 62 65 67 63 60 57 50

No. Of Noise Sources 2 nos 3 3 3 3 3 3 3 3

Sound Power To The Room 0.08 m /s -15 -15 -15 -15 -15 -15 -15 -15

Room Size 5 m x 3 m x 5 m 75 m -5 -5 -5 -5 -5 -5 -5 -5

Reverbera�on Time 0.8 Sec -1 -1 -1 -1 -1 -1 -1 -1

Reverberant SPL 37 43 47 49 45 42 39 32

Sound Power to utlet 0.08 m s -15 -15 -15 -15 -15 -15 -15 -15

Distance To Listener 1.2 m -13 -13 -13 -13 -13 -13 -13 -13

Direc�vity FactorGrill Size: 225 mm X 225 mm =

0.05m 3 4 5 6 8 8 9 9

Direct SPL 34 41 46 48 46 43 41 34

Resultant SPL 39 45 50 51 48 45 43 36

NC/NR Standard NC30 57 48 41 35 31 29 28 27

A�enua�on Required 0 0 9 16 17 16 15 9

dBA Correc�on -26 -16 -9 -3 0 1 1 -1

A-Weighted Equivalent 13 29 41 48 48 46 44 35

Resultant dBA Level without addi�onal a�enua�on 53

Schedule

Air Volume (m s) 2.5 Max Pressure loss(Pa) 50 Melinex Required Not Required

Code Width(m) Height(m) Length(m) Pressure Loss(Pa) Quan�ty

A32 800 800 900 30 1

3

2

3

3

3

2

3

A�enuator Performance

63 Hz 125 Hz 250 Hz 500 Hz 1 KHz 2 KHz 4 KHz 8 KHz

7 13 23 26 28 25 17 15

From product design to supply, Galloway Acoustics is the leader in comprehensive noise control solutions.

Each Galloway product meets certified international quality standards and is tested to BS 4718, ISO 7235, and BS EN ISO 140-3 1995 on a UKAS-accredited rig at Salford University in the UK.

We provide complete acoustic studies for generator rooms, chillers and cooling towers.

Galloway Acoustics' products are approved by major MEP consultants across the world for various prestigious projects including the Royal Opera House, Glasgow Airport, Edinburgh Airport stage 2, Birmingham New Hospitals, Princess Margaret Hospital (PFI)- Swindon, Corinthia Hotel- London, International Centre for Life- Newcastle, Museum of Future- Dubai, Oman Convention & Exhibition Center, Muscat International Airport and many more.

55 attenuator models with a variety of splitter configurations to attenuate various frequencies (low, medium and high).

Extensive range of louvres and Acoustic panels.

Galloway Acoustic products ensure low noise levels (NC 20/25) for TV studios, auditoriums, opera houses and theatres.

Galloway Acoustics' attenuators are assessed to BS 476 part 24 standards are suitable for smoke extract applications. They provide a fire rating of 2 hours for temperatures up to 300°C by Warrington Fire Exova (UK). No additional fire coating is required.

Optimised online acoustic calculation tool for selection of all acoustic products.

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REASONS TOCHOOSE GALLOWAYACOUSTICS

PROJECTREFERENCES

UAE

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Museum of the Future

VOX CINEMAS - MAF

Residence at Marina Gate 2, Dubai

The Oberoi Center at Bussiness Bay, Duabi

Sound Stage Complex at Studio City, Dubai

MARSA AL ARAB

Havard Medical School, Healthcare City, Dubai

SEA WORLD

Palm Jumeirah Marina Apartment, Dubai

Sidra Tower, Dubai

EXPO 2020

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EXPO 2020, Dubai

Muscat International Airport MC3, Muscat

Oman Convention and Exhibition Centre, Oman

Muscat International Airport MC1, (Utility 7 Generatorrooms), Muscat

Royal Opera House (Cultural Souq & Car Park), Muscat

TV Studio, Muscat

Barr Al Jissah Resort, Muscat

Cooling Tower at The Wave, Muscat

Ministry of Finance Office, Muscat

Higher Technical College, Muscat

Al Mussanah Airbase, Muscat

OMAN

GALLOWAY ACOUSTICS ENGINEERING SERVICES LLCEmail: info@gallowayacoustics.comwww.gallowayacoustics.com

Manufacturing Licensee by

Leminar Air Conditioning Industries L.L.CA: P.O.Box: 33539, Dubai, UAET: +971 4 456 1292 | F: +971 4 456 1293E: info@leminar.ae | www.leminarindustries.com