on average, adults spend more than

• On average, adults spend more than

90% indoors;

• Better IEQ protect our health,

contribute to our comfort, improve

productivity, increase profitability and

value of property, and attract & retain

more tenants;

• Poor IEQ may lead to discomfort and

illness, more sick leave and higher

absenteeism, and weaken our

competitiveness;

Why IEQ is important?

• 4 basic factors:

• Visual comfort

• Aural comfort

• Indoor Air Quality

• Thermal comfort

Indoor Environmental Quality

• Distinguish between discomfort vs. health hazard

Discomfort (examples) Health Hazard

Thermal Warm / cool sensation Heat stress, Cold stress

IAQ Odour Inhalation of toxic gases

Visual Glare, Eye strains Retina damages due to blue-

light hazard: Excessive

illumination with blue light or

UV radiation

Aural Noise annoyance Hearing damages

Normally, IEQ problem in built environment would not lead to

hazardous level, although sick symptoms may be reported.


Category Weighting (%)

Existing Building New Building

Site Aspects (SA) 18 25

Materials Aspects (MA) 12 8

Energy Use (EU) 30 35

Water Use (WU) 15 12

Innovations and Additions (IA) Bonus Bonus

Note: No Amendments have been made on the category weighting for the BEAM Plus NB and EB v1.2

Indoor Environmental Quality (IEQ) 25 20

Category Weighting

IEQ NB EB

No. of Prerequisites 1 1

No. of Credits 32 30

No. of Bonus 3 3

Credit Summary for NB:

IEQ P1 Minimum Ventilation Performance

IEQ 1 Security

IEQ 2 Plumbing and Drainage

IEQ 3 Biological Contamination

IEQ 4 Waste Disposal Facilities

IEQ 5 Construction IAQ Management

IEQ 6 Outdoor Sources of Air Pollution

IEQ 7 Indoor Sources of Air Pollution

IEQ 8 IAQ in Car Parks

IEQ 9 Increased Ventilation

IEQ 10 Background Ventilation

IEQ 11 Localized Ventilation

IEQ 12 Ventilation in Common Areas

IEQ 13 Thermal Comfort in Air-conditioned

Premises

IEQ 14 Thermal Comfort in Naturally

Ventilated Premises

IEQ 15 Natural Lighting

IEQ 16 Interior Lighting in Normally Occupied

Areas

IEQ 17 Interior Lighting in Areas Not

Normally Occupied

IEQ 18 Room Acoustics

IEQ 19 Noise Isolation

IEQ 20 Background Noise

IEQ 21 Indoor Vibration

IEQ 22 Access for Persons with Disability

IEQ 23 Amenity Features


NB Credits

IEQ NB EB

No. of Prerequisites 1 1

No. of Credits 32 30

No. of Bonus 3 3

Credit Summary for EB:


IEQ 1 Security

IEQ 2 Plumbing and Drainage



IEQ 5 Integrated Pest Management


IEQ 7 Outdoor Sources of Air Pollution

IEQ 8 Indoor Sources of Air Pollution

IEQ 9 IAQ in Car Parks



IEQ 12 Localized Ventilation

IEQ 13 Ventilation in Common Areas

IEQ 14 Thermal Comfort in Air-conditioned

Premises

IEQ 15 Thermal Comfort in Naturally

Ventilated Premises


IEQ 17 Interior Lighting in Normally Occupied

Areas

IEQ 18 Interior Lighting in Areas Not

Normally Occupied




IEQ 22 Access for Persons with Disability



EB Credits

IEQ P1 Minimum Ventilation Performance - Prerequisite

Exclusion:

Residential and similar buildings without central air conditioning.

Objective:

Ensure that a minimum quality and quantity of outdoor air is supplied to spaces

in the project in order to support the well-being and comfort of occupants.

Requirement:

Demonstrate that the project is in compliance with the minimum requirements of ASHRAE 62.1-

2007 in respect of Outdoor Air Quality; and Minimum Ventilation Rate.

Remark:





Good

Submission

Flow Rate Calculation based on MVAC Drawing & Spec

compared to ASHRAE 62.1-2007



Points to note:

This prerequisite is only applicable to normally occupied area.

Which of the following is a normally occupied area?

a.) Corridor?

b.) Office?

c.) Shopping mall?

d.) Serviced apartment with centralised a/c?

e.) School with split-type units?

IEQ 1 Security – 1 Credit

Exclusion:

None

Objective:

Engender a feeling of well-being amongst

building users.

Requirement:

1 credit for scoring at least 75% of the applicable security

measures and facilities for the building.

Remark:

Nil.


IEQ 1 Security


IEQ 1 Security

Good Submission

shall include points

& % achieved.

Good Submission

shall include

reference to drawing

or specification.

Good

Submission

Drawings with items highlighted +

Photographs + Checklist


IEQ 1 Security

IEQ 2 Plumbing and Drainage – 1 Credit

Exclusion:

None

Objective:

Reduce the potential for contamination of plumbing and drainage systems, the

ability of systems to carry infections, and the likelihood of odours.

Requirement:

1 credit for designs that reduce the potential for transmission of harmful bacteria viruses, and

odours.

Remark:

Fulfill 70% of the checklist’s requirement as stated in submission template.


IEQ 2 Plumbing & Drainage



Good

Submission

Access Panel Locations are marked on floor plan for easy

identification and are supported with photographs.

IEQ 3 Biological Contamination – 1 Credit

Exclusion:

Residential Buildings

Objective:

Ensure that the design, installation and facilities for operation and maintenance of air

conditioning systems, and water systems and features, are such as to reduce the risk of

biological contamination.

Requirement:

1 credit for complying with the recommendations given in the Code of Practice - Prevention of

Legionnaires Disease, in respect of air-conditioning and ventilation systems, and water systems.

Remark:

Fulfill 70% of the checklist’s requirement as stated in submission template.





Good

Submission

Checklist + Extract of Specification +

Drawings

IEQ 4 Waste Disposal Facilities – 1 Credit

Exclusion:

None

Objective:

Ensure that the design, installation and facilities waste disposal and recycling are such as to reduce

the risk of odours entering occupied areas or public areas.

Requirement:

1 credit for the provision of a de-odourising system in all refuse collection rooms and chambers

Remark:

• Provision of air purifying devices such as ‘Chemical Air Scrubber’, ‘Bio-oxygen Generator’,

‘Photo-oxidation Generator’ in RS&MRC.





Good

Submission Circled the Waste Recovery Chamber for easy identification



Good

Submission

The provision of air purification devices are stated in the tender

drawing.

NB – IEQ 5 / EB – IEQ 6 Construction IAQ Management – 1 Credit

Exclusion:

Residential and similar buildings not provided with central air-conditioning and ventilation systems.

Objective:

Ensure that building ventilation systems are not contaminated as a result of

residuals left over from construction activities.

Requirement:

1 credit for implementing a Construction IAQ Management Plan. (NB only)

1 credit for undertaking a building ‘flush out’ or ‘bake out’; and replacement of all filters prior to

occupancy.

Remark:

• Provision of Construction IAQ Management Plan by Contractor.

• Filtration media with Minimum Efficiency Reporting Value of 13 and shall be replaced after

construction

• Flushing duration subject to calculation of fresh air required to attain IAQ Good Class requirement





Items that should be included: Good

Submission

EB – IEQ 5 Integrated Pest Management – 1 Credit

Exclusion:

None

Objective:

Ensure that the management of pests is safe, hygienic and with limited

environmental impacts.

Requirement:

1 credit for implementing an integrated programme for pest management.

Remark:

NIL


IEQ 5 Integrated Pest Management


IEQ 5 (EB) Integrated Pest Management

Contract with Scope of Work +

Invoice + Photograph of Practices

Good

Submission

NB – IEQ 6 / EB – IEQ 7 Outdoor Sources of Air Pollution – 2 credits

Exclusion:

Buildings that are designed for natural ventilation or using de-centralised a/c system

Objective:

Demonstrate that airborne contaminants from external sources will not

give rise to unacceptable levels of indoor air pollution in normally

occupied spaces.

Requirement:

1 credit for demonstrating compliance with appropriate criteria for CO, NO2 and O3.

1 credit for demonstrating compliance with the appropriate criteria for RSP.

Remark:

• Align with HKSAR IAQ Certification Scheme or ASHRAE 62.1-

2007.


IEQ 6 Outdoor Sources Of Air Pollution

Parameter Unit 8-hr average

Excellent Good

Carbon Dioxide ppm < 800 < 1000

Carbon Monoxide g/m3 < 2000 < 10000

Respirable Suspended Particulates g/m3 < 20 < 180

Nitrogen Dioxide g/m3 < 40 < 150

Ozone g/m3 < 50 < 120

Formaldehyde g/m3 < 30 < 100

Total Volatile Organic Compounds g/m3 < 200 < 600

Radon Bq/m3 < 150 < 200

Airborne Bacteria cfu/m3 < 500 < 1000

Room Temperature oC 20 – 25.5 < 25.5

Relative Humidity % 40 – 70 < 70

Air Movement m/s < 0.2 < 0.3





Source: http://www.iaq.gov.hk/images/IAQ_Cert_excellent.jpg Source: http://www.iaq.gov.hk/images/IAQ_Cert_good.jpg

Copyright © 2011 Business Environment Council

IAQ Certificate Issuing Body

NB – IEQ 7 / EB – IEQ 8 Indoor Sources of Air Pollution – 3 credits

Exclusion:

Items a) & b) are excluded for buildings that are designed for natural ventilation or using

de-centralised a/c system and without interior decoration

Objective:

Demonstrate that airborne contaminants, predominantly from inside

sources, do not give rise to unacceptable levels of indoor air pollution in

normally occupied spaces.

Requirement:

1 credit for demonstrating compliance with the appropriate criteria for VOCs.

1 credit for demonstrating compliance with the appropriate criteria for formaldehyde.

1 credit for demonstrating compliance with the appropriate criteria for radon.

Remark:

• Align with HKSAR IAQ Certification Scheme or ASHRAE 62.1-2007.

• Measurement under ‘windows-closed’ condition.


IEQ 7 Indoor Sources Of Air Pollution

NB – IEQ 8 / EB – IEQ 9 IAQ in Car Parks – 1 credit

Exclusion:

Buildings not provided with enclosed or semi-enclosed car parks.

Objective:

Meet the minimum requirements of performance in respect of air quality.

Requirement:

1 credit for demonstrating compliance with the design requirements specified in ProPECC PN 2/96.

Remark:

• Max concentration: CO, 100ppm; NO2, 1ppm

• Measurement duration: 5 minutes


IEQ 8 IAQ In Car Parks



Items that should be

included:

Good

Submission

NB – IEQ 9 / EB – IEQ 10 Increased Ventilation – 1 credit

Exclusion:

Residential and similar buildings without central air conditioning.

Objective:

Ensure that ventilation systems provide for effective delivery to support the well

being and comfort of occupants in normally occupied spaces.

Requirement:

1 credit for demonstrating an outdoor ventilation rate that exceeds ASHRAE 62.1:2007

requirements by at least 30%.

Remark:

• Can demonstrate by calculation or measurements.





Good

Submission

Flow Rate Calculation based on MVAC Drawing & Spec

compared to ASHRAE 62.1-2007

NB – IEQ 10 / EB – IEQ 11 Background Ventilation – 1 credit

Exclusion:

Buildings not designed to utilise natural ventilation

Objective:

Ensure that normally occupied premises designed to utilise natural

ventilation are provided with a minimum of background ventilation to

control indoor air pollutants.

Requirement:

1 credit where it can be demonstrated that adequate ventilation can be achieved by natural means.

Remark:

• Can demonstrate compliance by CFD or measurements.

• Minimum 2 ACH in habitable room





Modelling method, calculation and

assumptions are included

Good

Submission

NB – IEQ 11 / EB – IEQ 12 Localized Ventilation – 1 credit

Exclusion:

The second credit is excluded for Residential buildings.

Objective:

Prevent exposure of building occupants to concentrated indoor sources of

pollutants.

Requirement:

a) Source control

1 credit for the provision of an adequate ventilation system for rooms/areas where significant indoor

pollution sources are generated.

b) Local exhaust (NB only)

1 credit for the provision of a general exhaust system for future tenants.

Remark:


IEQ 11 Localised Ventilation


IEQ 11 Localised Ventilation

Equipment schedule & air

schematic are included

Good

Submission

NB – IEQ 12 / EB – IEQ 13 Ventilation in Common Areas – 1 credit + 1 bonus credit

Exclusion:

Spaces covered under the section on IEQ 11 Localised Ventilation

Objective:

Ensure adequate ventilation in common areas and circulation routes within

premises and to avoid cross-contamination between areas. Requirement:

a) Ventilation by any means

1 credit for demonstrating that all enclosed common areas in a building are provided with

adequate ventilation.

b) Use of natural ventilation

1 BONUS credit where the provision for ventilation is by natural means (> 0.5 ACH).

Remark:

• Ventilation rate complies with ASHRAE62.

• At least 80% of common areas are by naturally ventilated.


IEQ 12 Ventilation In Common Areas


IEQ 12 Ventilation In Common Areas

NB – IEQ 13 / EB – IEQ 14 Thermal Comfort in Air-Conditioned Premises – 2 credits

Exclusion:

Buildings where air-conditioning is provided by window units or split units.

Objective:

Ensure that the air-conditioning system can provide the stated design

conditions in occupied spaces under changing load conditions.

Requirement:

a) Temperature

1 credit for sustaining the air temperature at the design value within ±1.5C when the air side

system is operating at steady state under normal occupied periods.

b) Room air distribution

1 credit where room air diffusers satisfy the Air Diffusion Performance Index.

Remark:

• For temperature measurement, ensure 90% prescribed area fulfill the requirement.

• ADPI can by calculation or by in-situ measurement.

• IAQ certificate covering all parts of building can be as alternative. (For Part a and EB only)


IEQ 13 Thermal Comfort In Air-Conditioned Premises


IEQ 13 Thermal Comfort In Air-Conditioned Premises

Measurement location,

device and data log

Good

Submission

NB – IEQ 14 / EB – IEQ 15 Thermal Comfort in Naturally Ventilated Premises – 2 credits

Exclusion:

Buildings where not designed to utilise natural ventilation.

Objective:

Promote the application of measures that reduce elevated temperatures caused

by external heat gains, and ensure installed a/c units can provide adequate

control of indoor temperature.

Requirement:

a) Performance with natural ventilation

1 credit for demonstrating indoor operative temperatures in occupied/habitable rooms meet the

80% acceptability limits.

Alternatively,

1 credit for demonstrating the Predicted Mean Vote (PMV) in occupied/habitable rooms is

between –1 and +1.


IEQ 14 Thermal Comfort In Naturally Ventilated Premises

NB – IEQ 14 / EB – IEQ 15 Thermal Comfort in Naturally Ventilated Premises – 2 credits

Requirement:

Alternatively,

1 credit for demonstrating that, the thermal performance, and the internal wind speeds,

of the occupied/habitable rooms fall within the 80% acceptability range for the tropical

climate conditions of Hong Kong.

b) Performance with air-conditioning

1 credit for sustaining the air temperature at the design value within ±1.5C when the air-

conditioning unit is operating at steady state under normal occupied periods.



NB – IEQ 14 / EB – IEQ 15 Thermal Comfort in Naturally Ventilated Premises – 2

credits

Remark:

• By thermal analysis for worst case scenario, most susceptible to external heat gain or

do not benefit from the prevailing climatic conditions.

• For temperature measurement, ensure 90% prescribed area fulfill the requirement.





Parameter

Clothing (clo)

Air temp. (°C)

Mean radiant temp. (°C)

Activity (met)

Air speed (m/s)

Relative humidity (%)





Good

Submission

Results present in a way that is easy

to understand

NB – IEQ 15 / EB – IEQ 16 Natural Lighting – 2 credits

Exclusion:

None

Objective:

Encourage a holistic examination of site layout, building design, and

fenestration design, such as to maximize access to daylight for the purposes of

improved health and comfort.

Requirement:

1 credit where at least 80% of floor area in all normally occupied spaces is adequately lit

with and average daylight factor of 1% or more.

1 credit where at least 95% of floor area in all normally occupied spaces is adequately lit

with and average daylight factor of 1% or more. Remark:

• Daylight factor by measurement or estimation.







Good

Submission

NB – IEQ 16 / EB – IEQ 17 Interior Lighting in Normally Occupied Areas

1 credit + 1 bonus credit

Exclusion:

Residential buildings, hotels and apartment buildings.

Objective:

Ensure the adequacy and maintenance of visual comfort conditions achieved

by the electric lighting provisions in occupied spaces.

Requirement:

1 credit where the prescribed lighting performance in each type of premises in respect of

illuminance and lighting quality is achieved.

• prescribed lighting performance in respect of maintained illuminance and illuminance variation is

achieved; and

• the limiting unified glare rating is achieved and light sources have an appropriate colour rendering

index.

1 BONUS credit for providing automatic control of artificial lighting such as daylight sensors at

perimeter zone and/or occupancy sensor.


IEQ 16 Interior Lighting In Normally Occupied Areas

Remark:

• Calculation by computer

modelling.

• Normally occupied area:

Offices, conference rooms,

classrooms, workshop etc







Good

Submission

NB – IEQ 17 / EB – IEQ 18 Interior Lighting in Areas not Normally Occupied – 1 credit

Exclusion:

None

Objective:

Ensure the adequacy of artificial lighting provisions in common areas and service areas such as

plant rooms.

Requirement:

1 credit where the prescribed lighting performance in each type of common or service space in

respect of light output and lighting quality is achieved.

Remark:

• Parameters include illumiance, illuminace variation, glare index, and colour rendering index.

• Not normally occupied area: Lift lobbies, corridors, plantrooms etc.


IEQ 17 Interior Lighting In Areas Not Normally Occupied

EXCLUSION

Premises where speech intelligibility is not

important / Rooms with special acoustical

nature

OBJECTIVE

Improve acoustical properties of rooms where

speech intelligibility is important

REQUIREMENT

Comply with internal NC level

Comply with mid-frequency (500, 1000, 2000

Hz) reverberation time

Relaxation shall be allowed subject to nature

of building.

NB IEQ 18 / EB IEQ 19 Room Acoustics – 1 credit



When a number of NC (e.g. NC40) is

chosen, it defines the maximum

allowable sound level at all octave bands

centered at 63 Hz to 8000 Hz.



• Reverberation time (T60) is controlled in interior building

spaces to enhance speech intelligibility or enhance music

quality. It is the time it takes for sound to decay by 60dBA.

• Sabine’s equation

• Norris Eyring equation (for highly absorptive rooms)

A

VT

161.060

)1ln()(

161.060

S

VT

V is room volume, S is room surface area,

A is room absorption, α is average sound

absorption coefficients. (All in metric SI units)



• Time for sound energy to decay 60 dB


Reverberation Time

• Reverberation will affect the speech clarity

• Long reverberation time ‘Live’ room with echo

• Short reverberation ‘Dead room’

• Optimum reverberation time: 0.4s to 0.8s


Reverberation Time

Performance Criteria:

a.) Office Type Premises

RT < 0.6s and within NC40

b.) Classroom & Similar Premises

RT < 0.6s and within NC35

c.) Residential Premises, Hotel and

Apartment

0.4s < RT < 0.6s and within NC30

d.) Indoor Games Hall & Swimming Pool

RT < 2s and within NC45



EXCLUSION

Premises which are inherently noisy and

unaffected by noise from adjacent

premises

OBJECTIVE

Improve the noise isolation to reduce

impact of unwanted noise

REQUIREMENT

Comply with noise isolation requirements

For residential only:

Bonus credit for complying with Impact

Noise Isolation requirements



NB – IEQ 19 / EB – IEQ 20 Noise Isolation – 1 credit + 1 bonus credit


a.) Office Premises

Between 2 offices, Dw = 38dB

With privacy, Dw = 48dB

Cellular offices, NIC = 40

b.) Classrooms

Between classrooms (Same floor):

STC37

Between classrooms (between floor):

STC50, IIC46




c.) Residential Premises & Hotel Room

Partition between WC and rooms

DnT, w > 38dB

Partition and floors between rooms

and room / corridor,

DnT,w > 50dB




d.) Residential Premises

Bedroom to living room:

STC 46 (same residential unit)

Bedroom to bedroom:

STC 52, IIC 52 (between units)

STC 44 (same unit)

Living rooms to living room

STC 52, IIC 52 (between units)



EXCLUSION

Building / Premises in which speech

intelligibility is not important

OBJECTIVE

Control as far as practicable the

background noise in premises at

levels appropriate to the intended

use of the premises

REQUIREMENT

Demonstrate background noise levels

are within the prescribed criteria



NB – IEQ 20 / EB – IEQ 21 Background Noise – 1 credit


a.) Office Premises

Private offices and small conference

rooms: 40 dB LAeq, T = 8 hours or

45 dB LAeq, T = 5 minutes

Large landscaped office: 45 dB

LAeq, T = 8 hours or 50 dB LAeq, T

= 5 minutes

b.) Classrooms

< 45 dB LAmax in urban area

<= 40 dB LAmax between 08:00 to

16:00




c.) Residential Premises and hotel rooms

Bedroom under window closed

conditions:

30 dB LAeq, T = 8 hours or 35 dB LAeq,

T = 5 minutes and <45 dB between

23:00 to 07:00

Habitable rooms under window closed

conditions: <55 dB LAeq, T = 16 hours

between 07:00 to 23:00

d.) Indoor games halls & indoor swimming

pools

<50 dB LAeq, T = 5 mins



NB – IEQ 21 Indoor Vibration – 1 credit

Exclusion:

None

Objective:

Avoidance of excessive vibration from

building services equipment and

external sources.

Requirement:

1 credit for demonstrating vibration levels

shall not exceed the prescribed criteria.

Remark:

Consideration of building services equipment.


IEQ 21 Indoor Vibration

IEQ 22 Access for Persons with Disability – 1 credit

Exclusion:

None

Objective:

Ensure full access to pertinent building facilities for persons with disability.

Requirement:

1 credit for providing at least 3 enhanced provisions for disabled persons.

Remark:

Recommended measures as stipulated in latest version of Code of Practice for Barrier

Free Access


IEQ 22 Access For Persons With Disability



Source: http://www.bd.gov.hk/english/documents/code/e_bfa2008.htm

http://www.bd.gov.hk/english/documents/code/e_bfa2008.htm



Explanation, extract from Barrier Free

Access, and Supporting Drawings

Good

Submission

NB IEQ 23 Amenity Features – 2 credits

Exclusion:

None

Objective:

Improve the standard and quality of buildings.

Requirement:

a) Amenities for the benefit of building users.

1 credit for providing at least 3 amenity features that enhance the quality and

functionality of building to the benefit of building users.

b) Amenities for improved operation and maintenance.

1 credit for providing at least 3 amenity features that allow for improved operation and

maintenance of the building and its engineering services.





Mobile-Spider

System Drawing

Explanation and supporting drawings

are included

Good

Submission

Green features - Balconies, Podium Gardens & Mail Delivery Rooms

Amenity features - Air-conditioning Platforms, Prestigious Entrances & Residents’ Clubhouses




EB IEQ 23 Amenity Features – 2 credits

Exclusion:

None

Objective:

Improve the standard and quality of buildings.

Requirement:

1 credit for providing 50% of listed amenity features that enhance the quality and

functionality of a building.

2 credits for providing 75% of listed amenity features.

Remark:

Nil



on average, adults spend more than

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