NOISE CONTROLF O R I N D U S T R Y A N D C O M M E R C E

Galloway Acoustics standard rectangular silencers are generally manufactured from pre-galvanised steel sheets and constructed in accordance with DW144 and as per the construction specification shown in the table below. The longitudinal joints shall be Grooved / Pittsuburg seam filled with mastic sealant. Due to the splitter casings being riveted to the main attenuator case creating an inherently stiff component, interme-diate stiffeners are only used on attenuator lengths over 1800 mm as required. Also available with Stain-less steel and Aluminium casing.

CASING THICKNESS as per DW144 Class A/BUpto 1000 mm - 0.80 mm1001 to 2500 mm - 1.00 mm2501 to 3000 mm - 1.20 mm

CASING THICKNESS as per DW144 Class C

Upto 1000 mm - 0.8mm1001 to 1600 mm - 1.00 mm

1601 to 2500 mm - 1.20 mm

END FLANGES as per DW144 Class A/B

( Upto +1000 Pa, Pressure Class )Upto 800 mm-20/25 mm Slip on flanges801 to 1600 mm- 30/35 mm Slip on flanges1601 to 3000 mm - 40/45 mm Slip on flanges

END FLANGES as per DW144 Class C

(Upto +2000 Pa,Pressure Class)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

Rectangular Silencer Construction

Leminar Air Conditioning Industries, is the sole manufacturing licensee for Galloway Acoustics-UK product range for the geographical market covering UAE, Oman, Qatar and Bahrain.

Galloway Acoustics originally began life in 1994 as Attenumate, which was then a subsidiary of Duct-mate (Europe) Ltd, part of the Galloway Group servicing the Acoustics market for both noise control products and acoustic consultancy.

The agreement between Galloway Acoustics (UK) and Leminar Air Conditioning Industries, has been in place since 2003 and Leminar has successfully deliv-ered sound attenuators to all major projects through-out the region.

Leminar has signed an agency agreement with M/s. Multitech LLC (A Bahwan Group of Company) Oman, for distribution of Galloway Acoustics product range all over The Sultanate of Oman.

Until the year 2001, Galloway Acoustics– UK was the only UK company who have tested their silencers to BS 4718 and ISO 7235 on a UKAS accredited rig at Salford University (England , UK) ,the first of its kind.

With regard to the results obtained the items that were measured to both standards were: -

Static Insertion Loss (dB) Inlet and outlet flow generated noise (dB)Silencer pressure loss due to airflow (Pa.)

UKAS Accredited test rig to BS 4718 & ISO 7235 at Salford University used for the testing of Galloway Acoustics silencers. This test rig was designed, manufactured and installed by Galloway Acoustics

Rectangular and Circular Sound Attenuators Manufacturing of Rectangular Attenuators

Standard Construction for Rectangular silencers

Multi- Section Silencers

01

Available Models:-

Galloway Acoustics currently has 55 different silencer configurations, A1 to A55, in its range, 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 mm.

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

CAXT 1 & 2 SILENCERS – The units are manufactured as above with spigot connections 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 that system.

Rectangular silencers of Galvanised, Stainless Steel, Aluminium construction (Class A, B & C).

Circular silencers of Galvanised, Stainless Steel, Aluminium construction.

Fire rated construction meeting requirements of BS 476 part4 (Fire) and BS 5588 Part A (Smoke).

Silencers with Melinex lining over the infill material which are 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 for 2 hrs fire rating for temperatures upto 300 degree celcius by Warringtonfire Exova- UK and do not require any additional fire coating.

Multi-section Silencers for any width or height.

Vertical Bend, Horizontal Bend, T-section, Z-section silencers.

Crosstalk attenuators.

Acoustic and Non Acoustic louvers.

Acoustic screens and enclosures.

Product ranges:Splitters

Different people may well have varying degrees of tolerance from one type of noise to another. The starting point has always got to be ‘what are the design requirements’. For instance what is the appli-cation and what are the acceptable noise levels for such an environment. NR (Noise Rating) and NC (Noise Criteria) levels are sound curves that can be used, as a guide to estimate how ‘loud’ a certain noise will appear to the human ear. Refer Fig-2.

The Sound Power level of the equipment is the start-ing point of any acoustic calculation, while the speci-fied noise is the end meeting the required attenua-tion by selecting a suitable attenuator, refer Fig-3.

Studios and Auditoriums Residential buildings / Private dwellings Cooling Towers Generator Rooms Airports Hospitals Public buildings like mosques, theaters, libraries, museums, swimming pools, etc. Hotels, Restaurants, Shops, Stores. Industrial buildings like warehouses, workshops, garages, etc.

Applications

Galloway Acoustics Cylindrical Silencer Constructional Specification

Silencer Selection:-

All GALLOWAY attenuators have aerodynamically shaped bullnose fairings to the front and back of the splitters to have a reduced pressure drop. The baffles shall have rockwool infill material of 45 Kg/ m density and minimum installed compression rating of 5% and retained behind 22G thick expanded metal / perfo-rated sheet facing to avoid erosion of fibres at higher velocity. The infill material with a black glass tissue facing shall be inert, non combustible, non hygro-scopic, vermin proof, rot proof and will not support bacterial growth.

Circular Attenuators

Available Models:-

Refer Fig-1 for sample data sheet.

02

Available Models:-

03

Fig-3

Recommended NR and NC Criteria For Various Applications

Fig-1

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 17A39 900 0m/s STATIC 10 17 30 36 38 36 24 20A39 1250 0m/s STATIC 11 21 39 48 52 49 30 24A39 1500 0m/s STATIC 13 24 46 54 60 58 36 28A39 1800 0m/s STATIC 15 28 52 60 65 66 40 31A39 2100 0m/s STATIC 16 32 52 60 65 68 47 34A39 2400 0m/s STATIC 17 36 52 60 65 70 53 38

GALLOWAYACOUSTICS

ATTENUMATERECTANGULARSILENCERSMODEL A39DATA SHEET

• Meets major mechanicalservices 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 Noise INLET 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:∆∆∆∆p = V (FACE) 2 x 0.6 x k

Table 3 Pressure Loss

Fig-2GALLOWAYACOUSTICS

A39

Standard Drawings

HORIZONTALBLEND

F

C

AIR FLOW

A

*HB*J F

G

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

CG

H

E

B

AIR FLOW

AJ

D

T - SECTION

C

B A

50SPIGOT

D

STEPPED SPIGOT

50SPIGOTB

OVERAL

L LENG

THA

STRAIGHT SILENCER

C

OVERAL

L LENGT

HA

B

MULTI - SECTION

C

C

E

D

D

Fire Rated Sound Attenuator Sound Attenuator for Smoke Extract

04

The above attenuators with FFC 250 fire coating are tested to BS 476 part 24 for 2 hours fire rating for stability and integrity which will be suitable for fire temperatures as per the Cellulosic curve.

The above attenuators are assessed by Warrington Fire Exova (UK) to BS 476 part 24 as suitable to be used for carrying smoke and hot gases upto 300 degrees celcius for a period of 120 minutes. These ducts do not require any additional fire coating.

ACOUSTIC & NON-ACOUSTIC LOUVRES

Galloway Acoustics have designed their range of acoustic and non-acoustic louvers and can accommo-date all potential applications that may require the use of louvers. All potential applications that may require the use of louvers. All the acoustic options have been tested at Aalford University to UKAS accredited standard.

Acoustic single leaf or double leaf louvred doors can be manufactured from either the 150mm or 300mm deep design but in both cases due to practical space and weight restrictions are only offered as a single bank option. Alternatively a nonacoustic louvred door can be offered with a back blanking plate to match areas of louvre banks that require the acoustic perfor-mance of a double bank design.

Standard Construction Specifications & Models

Introduction

The acoustic performance figures for our standard range of acoustic louvres are shown opposite. These are based upon sound insulation (Sound Reduction Index) tests carried out by Salford University in a UKAS accredited test facility and procedure in accordance with BS EN ISO 140-3 1995.

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.’

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

Acoustic Design

Acoustic and complimentary non-acoustic louvresThere are four types of acoustic louvres, these are: -

L-AS-150 Single Bank 150mm deep, 150mm pitch

L-AD-150 High performance Double Bank 2 nos 150mm deep (304mm overall), 150mm pitch

L-AS-300 Single Bank 300mm deep, 150mm pitch

L-AD-300 High performance Double Bank 2 nos 300mm deep (604mm overall), 150mm pitch

Model Fr 63 125 250 500 1k 2k 4k 8kL-AS-150 dB 5 5 6 7 13 13 13 12L-AD-150 dB 6 7 9 14 22 19 19 18L-AS-300 dB 6 6 7 12 19 19 17 16L-AD-300 dB 8 10 11 20 27 27 26 25

Model Fr 63 125 250 500 1k 2k 4k 8kL-AS-150 dB 11 11 12 13 19 19 19 18L-AD-150 dB 12 13 15 20 28 25 25 24L-AS-300 dB 12 12 13 18 25 25 23 22L-AD-300 dB 14 16 17 26 33 33 29 28

05

Louvre Types

FIG A – Standard 150 Deep Acoustic Louvre(and complementary non-acoustic louvre)

150150 304

3131

Heigh

t ‘Y’

150m

mpit

ch

PF

BGBP

MF

Front Elevation L-AS-150Section

L-AD-150Section

L-NA-150Section

FIG B – Standard 300 Deep Acoustic Louvre(and complementary non-acoustic louvre)

Width ‘X’Louvre = X-15mm

Width ‘X’Louvre = X-15mm

Louv

re =

Y-15

mm

Louv

re =

Y-15

mm

Heigh

t ‘Y’

150m

mpit

ch

300150PF

BGBP

MF604

Front Elevation L-AS-300Section

L-AD-300SectionL-NA-150Section

3131

FIG C – Multi Section Louvre AssemblyMSW / MSH

BWO

C / O60°

Clea

r Ope

ning

Build

ersw

ork O

peni

ng

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

LD-AS-300

BPBG

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

FIG D – Acoustic and Non-Acoustic Louvre Doors

Louvre doors available in Single or Double leafBG - Optional birdguard to rear of doorBP - Optional blanking plate fitted to rear of door

The standard maximum single unit dimensions are 2400mm wide x 1800mm high for either the 150 or 300 depth design.Units above these dimensions will be manufactured as multi sections on the width (MSW) or height (MSH).For larger louvre banks, units can be both MSW and MSH.Individual louvre sections are bolted together, through the side panels, using M8 fixings and secured to the structure, also via the side panels, using fixings suitable to the structural surround.Where required bottom sections are strengthened to support the weight of the top units.

06

OptionalBirdscreen

OptionalLouvredCorner

Masonary�xings Concrete plinth

by othersStructural steelCorner post

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

Optional roof to createPenthouse louvreconstruction.Product Code ‘PEHO’

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

Product code ‘NS’. Please consult Technical Sales Staff to assist in the design.FIG E – Louvre Screen/Enclosure

Galloway Acoustics enclosure/screen systems are based upon five standard panel designs coded 1 to 5, type 1 being of the lowest acoustic performance and type 5 the highest. The differences between panels 1 and 5 are created by the application of varying infill components into the standard panel thicknesses.

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

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

Pentapost– High acoustic performance system with a quality aesthetic appearance. Used primarily for enclosure/screen systems that require architecturally pleasing details (fixings can be hidden) coupled with good acoustic performance.

Frameless/Site Assembly System – Primary applications for this system are internal constructions, many of which require differing aesthetic finishes applied to the internal/exposed panel face such as audiology rooms, recording studios, music practice rooms, permanent room partitions. Other applications include large industrial enclosures such as automotive spray paint booths.

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

The acoustic tests were carried out at Salford University to a UKAS accredited standard and in accordance with BS EN ISO 140-3 1995.

Acoustic Tesing at Salford University , UK

07

ACOUSTIC ENCLOSURES & SCREENS

Roof Panels

Roof Trim

Roof Rail

W all Panel

Floor Rail

Bolted, screwed or riveted togethersystem based on H-Frame SteelworkSupport System

BB

AAD

D

A-A noitceS

Section C-C

Section D-D

C

C

Double glazedwindow

B-B noitceS

Section A-A

Section B-B

D-D noitceSC-C noitceS

D

B

B

A

A

D

C

C

PANEL LAYOUT

FRAMEWORK LAYOUT

This system is generally abolt together construction

Pentapost Frame Panel Construction

H-Frame Panel Construction

08

Acoustic Louvres

Acoustic Enclosures ( Outside View)

Non Acoustic Louvre Doors Sound Attenuator

09

Complete Solution for Generator room Acoustics at Muscat International Airport

UKAS Certificates

Reason to Choose Leminar

A Comprehensive noise control solution ! Right from acoustic design to product manufacturing and supply.

Valid manufacturing licensee agreement with Galloway Acoustics (UK) who are the leading suppliers of acoustic products in the UK.

Complete Acoustic study for Generator rooms and Chillers.

Backed up with authentic test reports for its acoustic products tested to BS 4718, ISO-7235, BS EN ISO 140-3 1995 on a UKAS accredited rig in the UK.

Leminar team is fully trained by Galloway’s in their UK facility and in Dubai for acoustic design and calculations of complete range of acoustic products including sound attenuators , louvres, acoustic enclosures and screens

Galloway Acoustic design engineers are constantly on hand to assist Leminar with technical queries as and when required.

Team of Leminar acoustic engineers do selections on Galloway’s program and ensure prompt response on enquiries.

55 attenuator models with variety of splitter configuration to attenuate various frequencies (low medium and high)

Low noise levels as NC 20 / 25 for TV studios, Palaces, Auditoriums, Opera house, Theaters are also achievable by Galloway Acoustic products.

Sound attenuator suitable for smoke extract applications are assessed to BS 476 part 24 for 2 hours fire rating for temperature upto 300 degrees celcius by WarringtonFire Exova (UK). No additional fire coating is required in this case.

Silencers selected to match size of adjacent ductwork in most of the cases which avoids extra cost of transformation pieces on both side of silencers and additional length needed.

All silencers at the Leminar factory are manufactured as per specifications of Galloway Acoustics (UK) ensuring continuity of the product quality and its performance. Therefore the acoustic products as manufactured by Leminar Airconditioning Industries LLC would require no further acoustic testing.

Approved by major MEP consultants and executed many prestigious projects like Dubai World Central Airport, Muscat International Airport, Dubai Studio City, etc.

Competitive pricing as manufactured locally in Dubai and Doha.

10

A Sole Manufacturing Licensee all over UAE, Oman, Qatar and Bahrain

Leminar Air Conditioning Industries LLC P O Box 33539, Dubai, UAET: +971 4 333 8700 F: +971 4 333 9700, Email: laimarketing@leminar.ae

Leminar Air Conditioning Industries Co. Qatar WLL

P O Box 3841, Doha, Qatar T: +974 44 502153 F: +974 44 502154, Email: leminar@dyarco.com

www.leminarindustries.com

(A Joint Venture Company of Leminar UAE & Dyarco International Qatar)

P R O J E C T SMuscat International Airport -MC3

Oman Convention and Exhibition Centre

Sound Stage Complex-Dubai Studio City

Air Traffic Control Tower, The Dubai WorldCentral International Airport, Dubai

Muscat International Airport, MC1 package (Utility yard , Generator rooms, etc)

Royal Opera House - Cultural souk & Car Park,Muscat ,Oman Doha City Centre Expansion Phase 2, 3 A& B(East) Shangrila and Rotana Towers, Qatar Cooling Towers at The Wave - Muscat, Oman

Sultan Qaboos Hospital , Muscat, Oman

Barr Al Jissa Resort, Muscat, Oman

Interim Doha Convention Centre, Qatar

Accommodation Bldg for Police Staff New,Block-B Khalifa city-Abu Dhabi

TV Studio, Muscat, Oman

Laboratory Building at Dubiotech, Dubai

Construction of ADNOC Kindergarten and Primary School, Madinat Zayed City, Abu Dhabi

Khalifa Sports Stadium , Qatar

Sound Stages Complex, Dubai Studio City

Harvard Medical School, Dubai HealthcareCity, Dubai

Porto Arabia at The Pearl Qatar, Parcel -11 ATower F, Qatar

Ministry of Finance,Muscat, Oman

Police Center, Sharjah

East & West Car Park of Mall of the Emirates,Dubai

Higher Techinical College, Shinas, Oman

Al Tayer Car Showroom, Dubai

Al Mussanah Airbase, Oman

Khalifa Hotel, Aspire Zone, Doha, Qatar

Palm Jumeirah Marina Apartments, Dubai

Sidra Tower, Sheikh Zayed Road, Dubai

Arenco Tower, Dubai

The Oberoi Centre, Business Bay, Dubai

Kha

lifa S

ports

Stadium , Doha, Qatar

Roya

l Ope

ra Hou

se- Souq and Carpark, Muscat, O

man

Harv

ard M

edical S

chool, Dubai Healthcare city, Dubai

Al Ta

yer S

howro

oms, Dubai

Om

an Co

nventi

on and Exhibition Centre, Om

an

Mus

cat I

nterna

tional Airport -MC3

Doha

City

cente

r, Phase 3 A & B, Shangrila and Rotana Tow

ers, Doha, Qatar