Consultants in Noise and Vibration REPORT TITLE: ACOUSTIC

Consultants in Noise and Vibration
REPORT TITLE: ACOUSTIC REPORT IN SUPPORT OF PLANNING APPLICATION FOR A NEW
REPLACEMENT KITCHEN EXTRACT SYSTEM TO SERVE GIRAFFE RESTAURANT
AT 120 HOLLAND PARK AVENUE, LONDON W11 4UA
REPORT REF:
16251-002
ISSUED TO:
Giraffe Concepts Ltd
Churchill House
137 Brent Street
London
NW4 4DJ
ISSUED BY:
Chris Swiejkowski MEng MIOA
DATE:
January 2017
PHILIP ACOUSTICS LTD
107 Bancroft, Hitchin, Hertfordshire, SG5 1NB
Tel: 01462 431877
Email: admin@philipacoustics.co.uk
Member of The Association of Noise Consultants (ANC)
Registered in England No.: 4560265
CONTENTS
SUMMARY
1.
INTRODUCTION
2.
THE ROYAL BOROUGH OF KENSINGTON & CHELSEA ACOUSTIC REQUIREMENTS
3.
BACKGROUND NOISE SURVEY
4.
NOISE FROM MECHANICAL SERVICES EQUIPMENT
5.
VIBRATION FROM MECHANICAL SERVICES EQUIPMENT
6.
SPECIFICATIONS FOR NOISE & VIBRATION TREATMENTS
Appendix A:
Noise Survey Instrumentation
Appendix B:
Site Plan & Drawings
Appendix C:
Background Noise Levels
Appendix D:
Manufacturers Noise Data For Equipment
Appendix E:
Noise Model Calculation For Proposed Equipment
Appendix F:
Supplier Details For Noise & Vibration Treatments
Appendix G:
Noise Reduction Treatments For Equipment
Report 16251-002
Page 1 of 9
SUMMARY

Philip Acoustics has been commissioned to assess potential noise and vibration from a proposed new
replacement kitchen extract system to serve Giraffe Restaurant at 120 Holland Park Avenue, London W11 4UA.
The assessment considers Royal Borough of Kensington & Chelsea’s planning consent acoustic requirements.

As part of the assessment a background noise survey has been carried out over a seven day period including
sample weekdays and a weekend to establish minimum existing background noise levels during operational
times of the kitchen extract system at a position representative of outside nearest windows of noise sensitive
(residential) properties.

Based on results of the background noise survey and noise model calculations using equipment
manufacturer’s noise data, the overall noise level due to the proposed new replacement kitchen extract
system (with noise reduction treatment fitted) is calculated to comply with The Royal Borough of Kensington &
Chelsea’s planning consent noise requirements for mechanical services equipment.

The assessment includes benefit of a high performance silencer (attenuator) noise reduction treatment applied
to the proposed kitchen extract system atmosphere side ductwork. Specification details for the silencer noise
reduction treatment are included in Section 6.1 of the report.

Location for the new kitchen extract system fan is potentially structurally linked to residential properties within
upper floor levels of the building itself and therefore it is possible that equipment vibration could transmit into
these properties. It is recommended that appropriate vibration isolators be fitted to the kitchen extract system
components as good practice and to comply with Royal Borough of Kensington & Chelsea’s requirements.
Specification details for suitable vibration isolators are included in Section 6.2 of the report.
Report 16251-002
Page 2 of 9
1.
INTRODUCTION
A new kitchen extract system is proposed to be installed to serve Giraffe restaurant at 120 Holland Park
Avenue, London W11 4UA.
The new extract system is to replace an existing extract system and will comprise a fan (to be installed
internally) with associated ductwork, filters and a silencer, with exhaust to atmosphere via external ducting
(part existing ductwork to be retained) located to the rear of the building with a discharge aperture at roof level
of the building.
It is anticipated that as part of the planning process for the new replacement extract system, the Local
Planning Authority (The Royal Borough of Kensington & Chelsea) will require information in the form of an
acoustic report regarding noise and vibration from the proposed extract system in order to seek to protect the
amenity of residents in the vicinity with regard to possible noise and vibration emissions.
Philip Acoustics has therefore been commissioned to provide an acoustic assessment for the proposed new
replacement extract system. This report presents results of the assessment and includes:

Confirmation of Royal Borough of Kensington & Chelsea’s planning consent acoustic requirements;

Measurement of existing background noise levels;

Calculation of extract system noise levels;

Consideration of vibration from the extract system;

Review and specification of noise / vibration control treatments necessary to ensure compliance with the
planning consent requirements of The Royal Borough of Kensington & Chelsea.
As forward to this noise assessment report, it is noted that the proposed new replacement kitchen extract system with noise
reduction treatment as specified and compliant with the noise limit requirements of The Royal Borough of Kensington &
Chelsea, will contribute substantially lower noise emissions to the surrounding environment, including to outside residential
windows, as compared with noise currently from the existing installed extract system. Thus the proposed new replacement
kitchen extract system will be of considerable benefit not only for operation of the restaurant but for occupiers of surrounding
properties generally.
2.
THE ROYAL BOROUGH OF KENSINGTON & CHELSEA ACOUSTIC REQUIREMENTS
Supplementary Planning Document (SPD): Noise Adopted May 2009 supporting the Royal Borough of
Kensington & Chelsea Local Development Framework (LDF) covers in detail noise issues relating to a wide
range of noise and vibration related planning scenarios including of proposed new mechanical services
equipment.
Section 6: Noise Generating Development and Section 7: Vibration includes advice and acoustic related
planning requirements specifically for new mechanical services equipment (building services plant) as
summarised in the sections on the following page.
Report 16251-002
Page 3 of 9
2.1
Noise
Paragraph 6.1 of Section 6: Noise Generating Development advises that building services plant and
equipment will be subject to the imposition of the following condition (shown on the following page), where it is
considered appropriate to protect residential amenity:
“Noise emitted by external building services plant and equipment shall not increase the
existing concurrent measured lowest LA90(15min) background noise level at any time
when the plant is operating. The noise emitted shall be measured or predicted at 1.0m
from the façade of the nearest residential window or at 1.2m above any adjacent
residential garden, terrace, balcony or patio. The plant and equipment shall be
serviced regularly in accordance with manufacturer’s instructions and as necessary to
ensure that the requirements of the condition are maintained.”
Paragraph 6.1 also advises that the actual wording of the above condition may change to reflect the
specific site circumstances. Notwithstanding this, it is the author’s experience that most sites similar to
that at 120 Holland Park Avenue with a proposed new replacement kitchen extract system, and granted
planning consent by Royal Borough of Kensington & Chelsea, have the above condition applied without
alteration to the wording.
In addition, Paragraph 6.2 of Section 6: Noise Generating Development includes reference to noise
assessment procedures and guidance contained within British Standard BS4142:1997 “Method for rating
industrial noise affecting mixed residential and industrial areas”.
It is noted that BS4142:1997 is now withdrawn and replaced by BS4142:2014 “Methods for rating and
assessing industrial and commercial sound” which came into force in October 2014. However the guidance
and principles of BS4142:2014 are broadly as those of BS4142:1997 and therefore for purpose of this report
and with specific reference to The Royal Borough of Kensington & Chelsea’s SPD: Noise, it is considered
appropriate to still refer to BS4142:1997.
Paragraph 6.2 advises that when a “…new noise source does not attract the +5dB correction of para 8 of
BS4142 the Rating Level shall be 10dBA below the measured background noise level LA90, where the new
source would attract the +5dB correction the difference shall be -15dB……”.
The noise assessment procedures and guidance contained within British Standard BS4142 are quite
technically complex. However in simple terms by referencing BS4142, Paragraph 6.2 requires that if noise
from the equipment does not produce strong tonal elements or have other very noticeable noise
characteristics (such as impulses etc.) then noise from the equipment shall be no higher than 10dBA below
the background level, whereas if the noise from the equipment is expected to have strong tonal elements or
other very noticeable noise characteristics then noise from the equipment shall be no higher than 15dBA
below the background level.
Although it is expected noise of the new replacement kitchen extract fan system with the recommended
silencer fitted (see Section 6.1) would be broadband type noise without any strong tonal or intermittent
characteristic sufficient to attract attention, for the purpose of this noise assessment report it is cautiously and
worse-case taken that the noise could potentially have a tonal characteristic and therefore the more stringent
noise limit requirement of 15dBA below the background level is applied.
Report 16251-002
Page 4 of 9
2.2
Vibration
Paragraph 7.8 of Section 7: Vibration advises that building services plant and equipment shall be supported
on proprietary anti-vibration mounts and that any permission granted will normally contain a condition
necessary to control plant vibration as follows:
“The plant shall be supported on adequate proprietary anti-vibration mounts as
necessary to prevent the structural transmission of vibration and regenerated noise
within adjacent or adjoining premises and these shall be so maintained thereafter.”
3.
BACKGROUND NOISE SURVEY
In order to assess noise from the proposed new replacement kitchen extract system against The Royal
Borough of Kensington & Chelsea’s planning consent noise requirement it is necessary to establish
representative minimum background noise levels outside the nearest windows of residential properties.
Details of the background noise survey carried out by Philip Acoustics are provided in Sections 3.1 to 3.3.
3.1
Instrumentation
Details of the noise survey instrumentation used are provided in Appendix A. The sound level meter was
calibrated before and after the survey measurements using the UKAS certified calibrator.
3.2
Measurement Procedure
The client has advised the new replacement kitchen extract system will operate during opening hours of the
restaurant nominally in the range 7:30am to 11pm Monday to Friday and 8am to 11pm Saturday and Sunday.
The noise survey was carried out over a seven day period from 4 January 2017 through 10 January 2017 to
include sample weekdays and also a weekend, and to obtain background noise levels during the entire range
of operational times for the system. The weather included dry and calm conditions during the survey day and
also night periods.
Nearest windows of noise sensitive (residential) properties to the kitchen extract system ductwork and
aperture are rear windows of the flats within upper floor levels of the building itself, overlooking the rear
courtyard / terrace areas behind the building. Nearest of these windows is approximately 3m from the location
of the kitchen extract system aperture.
The background noise survey measurement location was externally at the second floor level terrace to the
rear of the building using an extension pole and microphone extension lead arrangement, selected as being
representative of, as best accessible and as practicably closest to, outside the nearest residential windows.
Location for the new replacement kitchen extract system components, direction to the nearest residential
windows and position for the background noise survey are shown on the drawings in Appendix B.
3.3
Measurement Results
Existing noise levels in the vicinity are predominantly due to traffic along surrounding roads, general activity in
the local area, albeit with significant contribution of noise from the existing kitchen extract system serving
Giraffe restaurant as well as from an extract system serving a neighbouring other restaurant.
Report 16251-002
Page 5 of 9
A graph showing full raw data background noise level measurements over the seven day survey period is
provided in Appendix C. Summary of the representative minimum measured LA90 background noise level and
corresponding noise requirement are shown in Table 1.
Note that the Giraffe Restaurant is existing / trading and with the existing kitchen extract system in use until
approximately 11:00pm, thus it was not possible to switch off the fan of the existing system between these
hours to obtain representative background noise levels. To remove contamination and any influence of noise
from the existing extract system on the background noise survey results for use in the assessment, then the
noise levels measured immediately before and immediately after the existing fan was switched on / off are
cautiously and as worse-case taken as being representative of the minimum background noise levels during
operational times for the new replacement kitchen extract system.
Description
Representative Minimum
Background Noise LA90 (5 min)
The Royal Borough Kensington &
Chelsea Noise Limit
(set 15dB below background)
46dB
≤ 31dBA
Minimum background level outside nearest residential
windows (occurs circa 11:30pm)
Table 1: Representative minimum background noise level and corresponding noise limit requirement
4.
NOISE FROM MECHANICAL SERVICES EQUIPMENT
The client has advised the proposed new replacement extract fan is a Flakt Woods model Estoc Targe 80-630-3.
A copy of available manufacturer’s noise data for this proposed fan is provided in Appendix D.
Summary of noise data for the extract fan in terms of equivalent overall dBA and linear dB octave band sound
power levels is shown in Table 2. The summary noise data in Table 2 is without yet any noise reduction
treatment applied (i.e. is based on un-silenced manufacturer noise data). The outlet sound power level takes
account of any natural attenuation that occurs through system duct losses (duct length and any duct bends
etc.) as well as aperture end reflection.
Description
Flakt Woods Estoc Targe 80-630-3
Outlet Sound Power Level
Overall
dBA
79
Octave Band Centre Frequency Hz (linear dB)
63
125
250
500
1k
2k
4k
8k
70*
79
78
78
73
67
62
56
*No manufacturer noise data for 63Hz octave band, sound power level is as typical for this fan type & size
Table 2: Extract fan outlet Sound Power Level (un-silenced data)
To calculate the noise contribution from the new replacement kitchen extract fan system to outside nearest
residential windows a spreadsheet based noise model has been used. The model takes account of the
distance between the proposed new extract system aperture and nearest windows, acoustic directivity,
acoustic reflections and any natural line of sight acoustic screening.
Report 16251-002
Page 6 of 9
The noise model calculation also takes account of the silencer (attenuator) noise reduction treatment applied
to the system as specified in Section 6.1 of this report. Noise model calculation details are provided in
Appendix E.
The overall calculated noise level from the proposed new replacement kitchen extract system duct to outside
the nearest residential windows compared with The Royal Borough of Kensington & Chelsea’s planning
consent noise requirement is shown in Table 3.
Description
Assessment to outside nearest
residential windows
Overall Noise Level From
Replacement Extract System
The Royal Borough Kensington & Chelsea
Noise Level Limit (set 15dB below background noise)
30dBA
≤ 31dBA
Table 3: Equipment noise at nearest noise sensitive (residential) windows compared with noise limits
Table 3 shows that noise from the proposed new replacement kitchen extract system with the specified
silencer (attenuator) as detailed in Section 6.1 complies with The Royal Borough of Kensington & Chelsea’s
planning consent noise requirement. At this level, noise from the proposed new replacement kitchen extract
will be substantially below existing minimum background levels and be substantially below noise from the as
existing installed kitchen extract system. It is not expected that noise from the proposed new replacement
kitchen extract system would be detrimental to adjacent residential occupiers.
5.
VIBRATION FROM MECHANICAL SERVICES EQUIPMENT
Location for the new kitchen extract system fan is potentially structurally linked to residential properties within
upper floor levels of the building itself and therefore it is possible that equipment vibration could transmit into
these properties.
It is recommended that appropriate vibration isolators be fitted to the new equipment as good practice and in
accordance with Paragraph 7.8 of Section 7: Vibration of Supplementary Planning Document (SPD): Noise
Adopted May 2009 supporting the Royal Borough of Kensington & Chelsea Local Development Framework
(LDF). Specification details for suitable vibration isolators are provided in Section 6.2 of the report.
6.
SPECIFICATIONS FOR NOISE & VIBRATION TREATMENTS
Whilst this report is based on the specific proposed make and model of extract fan as detailed in Section 4, if
during later design stages, during construction or as part of routine equipment maintenance or equipment
replacement, an alternative make and model of extract fan is selected then it is important that noise levels for
the alternative equipment be checked by Philip Acoustics or another Acoustic Consultant to ensure the
treatments specified below remain valid and noise emissions remain compliant with The Royal Borough of
Kensington & Chelsea’s noise requirements..
Report 16251-002
Page 7 of 9
6.1
Noise
In order to comply with The Royal Borough of Kensington & Chelsea’s noise requirement it is necessary to
specify noise reduction treatment to the proposed new replacement kitchen extract fan as below and are as
included in the noise model calculation.
Note that Philip Acoustics can only advise on noise and vibration issues and therefore it is recommended that
professional advice from others may need to be sought to confirm suitability of the specified noise control
treatment with regard to non-acoustic issues such as airflow ventilation and system pressure drop.
Acoustic hardware suppliers for specified silencer would be able to assist with advice on airflow ventilation and
system pressure drop. Details of possible acoustic hardware companies who could supply the specified type
of silencer are provided in Appendix F.
It is recommended that a silencer (attenuator) be fitted to the kitchen extract fan system atmosphere side
ductwork to reduce noise levels in overall terms by at least -19dBA. Specification for the silencer is given in
Table 4; Note the limits provided in Table 4 for regenerated noise are associated with ventilation issues including airflow
rate and pressure drop and is intended to be used by the silencer supplier to aid selection of an appropriately sized silencer.
Octave Band Centre Frequency (Hz)
Description
63
125
250
500
1k
2k
4k
8k
Kitchen Extract Fan System: Flakt Woods Fan Model Estoc 80-630-3
Minimum Dynamic Silencer Insertion Loss (dB)
6
18
22
25
24
18
14
12
Maximum Regenerated Lw (dB)
54
51
46
43
39
39
38
34
Table 4: Specification details for replacement kitchen extract fan system atmosphere side silencer
The silencer insertion loss values in Table 4 are minimum values. A typically suitable silencer would be of
rectangular or square section approximately 1.2 to 1.5m long with splitter elements plus spigots or transition
pieces to connect to the kitchen extract fan ductwork. It is recommended that the silencer be suitable for
kitchen extract systems which would normally mean the silencer has a melinex (or similar) lining.
The silencer should be located internally within the building and immediately after or as close as possible to
the extract fan. However if the silencer is to be unavoidably located externally (as indicated on provided
drawings) it is recommended that the all internal duct section from the extract fan plus external duct section
from point where the duct exits the building up to and including the silencer be wrapped with high performance
acoustic lagging material (i.e. 1 x layer of Transhield plus 1 x layer of Transmat materials by Allaway Acoustics
or equivalent; see data sheets in Appendix G).
The normal build-up of deposits inside kitchen extract ductwork can degrade the performance of silencers
over time. It is important therefore to clean the inside of the oven extract fan silencer at regular intervals. This
cleaning should be at least every 6 to 12 months depending up on the level of deposit build up and would
normally take place during routine kitchen extract ductwork cleaning (usually an insurance requirement and
done at same time as cleaning of the fan). Cleaning is done by scraping heavy deposits from the inside of the
silencer using a non-sharp wooden or plastic implement and then cleaning off the remainder light deposits
with mild detergent and a soft brush. It is important that the cleaning process does not damage the melinex
lining of the silencer.
Report 16251-002
Page 8 of 9
6.2
Vibration
As detailed in Section 5, it is recommended the proposed new replacement kitchen extract fan be mounted
using vibration isolators. Specification detail for suitable vibration isolators are provided below. Details of
possible acoustic hardware companies who could supply appropriate vibration isolators are provided in
Appendix F.
It is recommended that the new replacement kitchen extract fan be installed using high performance spring type
vibration isolator hangers or mounts having a nominal static deflection minimum 15mm under the installed total
weight of the fan. Four isolators are normally required, one for each corner of an extract fan unit.
The hangers or mounts should only take weight of the extract fan unit; ductwork attached to the fan should be
supported by other separate rubber or neoprene vibration isolator hangers. The vibration isolators must
incorporate rubber or neoprene noise stop pads.
The extract fan unit must have ductwork flexible connections fitted. To be effective the flexible connections
need to be “loose” (not taught) when installed and would be typically formed using rubber or neoprene sheet
material, standard size flexible connections are available from most duct suppliers. It is not recommended to
use canvas type flexible connections as these are generally not as “loose” as rubber and neoprene
connections and do not therefore provide as much vibration isolation.
It is also recommended that the ductwork either side of the fan unit be mounted using proprietary rubber or
neoprene mountings.
Report 16251-002
Page 9 of 9
APPENDIX A
Noise Survey Instrumentation
Report 16251-002
Consultants in Noise and Vibration
Site:
120 Holland Park Avenue, London W11 4UA
Report:
16251-002 Appendix A
Date:
January 2017
NOISE SURVEY INSTRUMENTATION
Seven Day Background Noise Survey:

Rion sound level meter type NL-31 Class 1 serial number 01193690 with Rion preamplifier type NH-21 serial
number 31316 and Rion microphone type UC-53A serial number 317534 complete with weatherproof and
lockable outdoor environmental kit, Rion microphone extension cable type EC-04A, Rion microphone windshield
type WS-10 and tripod/extension boom arrangement;

Bruel & Kjaer calibrator type 4231 serial number 2326801 (UKAS certified);

Speedtech Instruments Skymaster model SM-28 serial number 19370 (for sample weather conditions data).
PHILIP ACOUSTICS LTD
107 Bancroft, Hitchin, Hertfordshire SG5 1NB
Tel: 01462 431877
Email: admin@philipacoustics.co.uk
Member of The Association of Noise Consultants
Registered in England No.: 4560265
APPENDIX B
Site Plan & Drawings
Report 16251-002
Consultants in Noise and Vibration
Site:
120 Holland Park Avenue, London W11 4UA
Report:
16251-002 Appendix B (page 1 of 4)
Date:
January 2017
SITE LOCATION PLAN
PHILIP ACOUSTICS LTD
107 Bancroft, Hitchin, Hertfordshire SG5 1NB
Tel: 01462 431877
Email: admin@philipacoustics.co.uk
Member of The Association of Noise Consultants
Registered in England No.: 4560265
Consultants in Noise and Vibration
Site:
120 Holland Park Avenue, London W11 4UA
Report:
16251-002 Appendix B (page 2 of 4)
Date:
January 2017
PROPOSED LAYOUT DRAWING
PHILIP ACOUSTICS LTD
107 Bancroft, Hitchin, Hertfordshire SG5 1NB
Tel: 01462 431877
Email: admin@philipacoustics.co.uk
Member of The Association of Noise Consultants
Registered in England No.: 4560265
Consultants in Noise and Vibration
Site:
120 Holland Park Avenue, London W11 4UA
Report:
16251-002 Appendix B (page 3 of 4)
Date:
January 2017
PROPOSED LAYOUT DRAWING
Kitchen extract aperture
above roof level
Nearest residential windows to
kitchen extract aperture
Background noise survey
position outside residential
window to rear of site
PHILIP ACOUSTICS LTD
107 Bancroft, Hitchin, Hertfordshire SG5 1NB
Tel: 01462 431877
Email: admin@philipacoustics.co.uk
Member of The Association of Noise Consultants
Registered in England No.: 4560265
Consultants in Noise and Vibration
Site:
120 Holland Park Avenue, London W11 4UA
Report:
16251-002 Appendix B (page 4 of 4)
Date:
January 2017
PROPOSED LAYOUT DRAWING
PHILIP ACOUSTICS LTD
107 Bancroft, Hitchin, Hertfordshire SG5 1NB
Tel: 01462 431877
Email: admin@philipacoustics.co.uk
Member of The Association of Noise Consultants
Registered in England No.: 4560265
APPENDIX C
Background Noise Levels
Report 16251-002
Consultants in Noise and Vibration
Site:
120 Holland Park Avenue, London W11 4UA
Report:
16251-002 Appendix C (page 1 of 1)
Date:
January 2017
BACKGROUND NOISE SURVEY RESULTS
PHILIP ACOUSTICS LTD
107 Bancroft, Hitchin, Hertfordshire SG5 1NB
Tel: 01462 431877
Email: admin@philipacoustics.co.uk
Member of The Association of Noise Consultants
Registered in England No.: 4560265
APPENDIX D
Manufacturers Noise Data For Equipment
Report 16251-002
Consultants in Noise and Vibration
Site:
120 Holland Park Avenue, London W11 4UA
Report:
16251-002 Appendix D (page 1 of 1)
Date:
January 2017
MANUFACTURER’S NOISE DATA FOR PROPOSED MECHANICAL SERVICES EQUIPMENT
Kitchen Extract Fan: Flakt Woods Model Estoc Targe 80-630-3
PHILIP ACOUSTICS LTD
107 Bancroft, Hitchin, Hertfordshire SG5 1NB
Tel: 01462 431877
Email: admin@philipacoustics.co.uk
Member of The Association of Noise Consultants
Registered in England No.: 4560265
APPENDIX E
Noise Model Calculation For Proposed Mechanical Services
Report 16251-002
Consultants in Noise and Vibration
Site:
120 Holland Park Avenue, London W11 4UA
Report:
16251-002 Appendix E (page 1 of 1)
Date:
January 2017
NOISE MODEL CALCULATION
ASSESSMENT POSITION A: Outside nearest rear window of residential flats at third floor of site itself
NOISE CONDITION: Opening hours of the restaurant
NOISE MITIGATION: Silencer to Kitchen Extract Fan (see Section 6.1 of Report 16251-002)
Lin dB at Octave Band Centre Frequency Hz
Equipm ent & Description
Overall
dBA
63
79
125
250
500
1k
2k
4k
8k
EXTRACT FAN: Flakt Woods m odel Estoc Targe 80-630-3
Sound pow er level Lw dB; external aperture outlet Lw
70
79
78
78
73
67
62
56
Attenuation; atmosphere side silencer to system
-6
-18
-22
-25
-24
-18
-14
-12
Distance; 3m from aperture to centre of residential window
-18
-18
-18
-18
-18
-18
-18
-18
Screening; nil line of sight screening correction applicable
0
0
0
0
0
0
0
0
Directivity; >90° directivity correction applicable for this source
-3
-4
-6
-7
-10
-15
-15
-15
0
0
0
0
0
0
0
0
Individual contribution at assessment location
Reflections; no correction applicable for high level aperture above roof level
30
43
39
32
28
21
16
15
11
Cum ulative contribution all sources at assessm ent position
30
43
39
32
28
21
16
15
11
*Fan Sound Power Level value at 63Hz has been estimated for noise assessment purposes.
Overall cumulative sound pressure level at assessment position due to new kitchen extract system operating during opening times
is 30dBA (with noise reduction treatment applied) and complies with Royal Borough of Kensington & Chelsea noise requirements.
PHILIP ACOUSTICS LTD
107 Bancroft, Hitchin, Hertfordshire SG5 1NB
Tel: 01462 431877
Email: admin@philipacoustics.co.uk
Member of The Association of Noise Consultants
Registered in England No.: 4560265
APPENDIX F
Supplier Details For Noise & Vibration Treatments
Report 16251-002
Consultants in Noise and Vibration
Site:
120 Holland Park Avenue, London W11 4UA
Report:
16251-002 Appendix F (page 1 of 1)
Date:
January 2017
DETAILS OF POSSIBLE SUPPLIERS FOR NOISE & VIBRATION TREATMENTS
Noise Reduction Treatment
Not listed in any order of recommendation or preference

Allaway Acoustics: 01992 550825, www.allawayacoustics.co.uk

AG Fabrications Ltd: 01268 785365, www.agfabrications.co.uk

Environmental Equipment Corporation Ltd: 01932 230940, www.eecnoisecontrol.co.uk

EMTEC: 020 8848 3031, www.emtecproducts.co.uk

See also technical data sheets in Appendix G for example acoustic louvres from various suppliers

In addition, most ventilation system suppliers including Air Vent Technology & Vent Axia (proposed suppliers for
the supply air AHU and oven extract fan) are able to provide suitable circular type silencers.
Vibration Isolators
Not listed in any order of recommendation or preference

Allaway Acoustics: 01992 550825, www.allawayacoustics.co.uk

EMTEC: 020 8848 3031, www.emtecproducts.co.uk

Christie & Grey: 01732 371100, www.christiegrey.com
PHILIP ACOUSTICS LTD
107 Bancroft, Hitchin, Hertfordshire SG5 1NB
Tel: 01462 431877
Email: admin@philipacoustics.co.uk
Member of The Association of Noise Consultants
Registered in England No.: 4560265
APPENDIX G
Noise Reduction Treatments For Equipment
Report 16251-002
Consultants in Noise and Vibration
Site:
120 Holland Park Avenue, London W11 4UA
Report:
16251-002 Appendix G (page 1 of 4)
Date:
January 2017
NOISE REDUCTION TREATMENTS FOR MECHANICAL SERVICES EQUIPMENT
Marked Up Drawing Indicating Noise Reduction Treatment Applied To Kitchen Extract System
Atmosphere side
silencer to Kitchen
Extract Fan system
Extract duct section from
extract fan up to and including
the silencer to be acoustically
wrapped / lagged
PHILIP ACOUSTICS LTD
107 Bancroft, Hitchin, Hertfordshire SG5 1NB
Tel: 01462 431877
Email: admin@philipacoustics.co.uk
Member of The Association of Noise Consultants
Registered in England No.: 4560265
Consultants in Noise and Vibration
Site:
120 Holland Park Avenue, London W11 4UA
Report:
16251-002 Appendix G (page 2 of 4)
Date:
January 2017
NOISE REDUCTION TREATMENTS FOR MECHANICAL SERVICES EQUIPMENT
Data Sheet For Example In-Duct Silencer: Allaway Acoustics
PHILIP ACOUSTICS LTD
107 Bancroft, Hitchin, Hertfordshire SG5 1NB
Tel: 01462 431877
Email: admin@philipacoustics.co.uk
Member of The Association of Noise Consultants
Registered in England No.: 4560265
Consultants in Noise and Vibration
Site:
120 Holland Park Avenue, London W11 4UA
Report:
16251-002 Appendix G (page 3 of 4)
Date:
January 2017
NOISE REDUCTION TREATMENTS FOR MECHANICAL SERVICES EQUIPMENT
Data Sheet For Transhield: Allaway Acoustics
PHILIP ACOUSTICS LTD
107 Bancroft, Hitchin, Hertfordshire SG5 1NB
Tel: 01462 431877
Email: admin@philipacoustics.co.uk
Member of The Association of Noise Consultants
Registered in England No.: 4560265
Consultants in Noise and Vibration
Site:
120 Holland Park Avenue, London W11 4UA
Report:
16251-002 Appendix G (page 4 of 4)
Date:
January 2017
NOISE REDUCTION TREATMENTS FOR MECHANICAL SERVICES EQUIPMENT
Data Sheet For Transmat: Allaway Acoustics
PHILIP ACOUSTICS LTD
107 Bancroft, Hitchin, Hertfordshire SG5 1NB
Tel: 01462 431877
Email: admin@philipacoustics.co.uk
Member of The Association of Noise Consultants
Registered in England No.: 4560265
Download PDF