Indoor Air Quality

9 Credits And 4 Points Available

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credit criteria

9.1  Ventilation System Attributes - 1 point is available where: The entry of outdoor pollutants is mitigated; The system is designed for ease of maintenance and cleaning; and the system has been cleaned prior to occupation and use. 9.2  Provision of Outdoor Air - 2 points are available where the nominated area is provided with sufficient outdoor air to ensure levels of indoor pollutants are maintained at acceptable levels. Options are available for mechanically and naturally ventilated buildings and for outdoor air provision or contaminant monitoring. 9.3  Exhaust or Elimination of 
Pollutants - 1 point is available where nominated pollutants, such as those arising from printing equipment, cooking processes and equipment, and vehicle exhaust, are limited by either removing the source of pollutants from the nominated area, or exhausting the pollutants directly to the outside while limiting their entry into other areas of the project.

 

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Indoor Environment quality

By rewarding both energy efficiency and encouraging occupant well-being, the Green Star rating system promotes and rewards a holistic approach to sustainability that results in multiple benefits. Such benefits would include: Reductions to occupant stress, Improvements to air quality through appropriate ventilation, the provision of high levels of thermal, visual and acoustic comfort and also reduced exposure to pollutants. Our diverse team of Professionals include, Architects, Engineers and ESD Specialists. We have been around long enough to work on all possible project types. See our Past Projects. Deemed to satisfy as our team goes through 100's Section J reports every year.

 

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One (1) point is awarded where project teams demonstrate that the ventilation system meets all of the following conditions:

  • The entry of outdoor air pollutants is mitigated, in accordance with 9.1.1;

  • The system is designed for ease of maintenance and cleaning, in accordance with 9.1.2; and

  • The system has been cleaned prior to occupation and use, in accordance with 9.1.3.

9.1.1 Entry of Outdoor Pollutants

The entry of outdoor air pollutants to the space must be minimised. The building ventilation systems must be designed to comply with ASHRAE Standard 62.1:2013 in regards to minimum separation distances between pollution sources and outdoor air intakes. Windows, doors, openings, vents, grilles, and skylights are all considered outdoor air intakes for purposes of this credit and must be modelled taking into account their free area.

Compliance is to be demonstrated in accordance with the distances specified in Table 5.5.1 of the Standard, however projects must also ensure compliance with any other requirement or guidance nominated within the Standard. Analytical solutions are also acceptable by following the example provided within Appendix F of ASHRAE Standard 62.1.

9.1.2 Design for Ease of Maintenance and Cleaning

Any mechanical ventilation system within the building, whether existing or new, must be designed to provide adequate access for maintenance, to both sides of all moisture and debris-catching components, within the air distribution system. Moisture-producing and debris-catching components include items such as cooling coils, heating coils, fan coil units, humidifiers and filters in the air handling system.

|| Where components do not have access for maintenance from both sides due to the size of the unit, project teams are encouraged to submit a technical question to the GBCA outlining how maintenance and cleaning processes of the air distribution systems components are achieved in line with the intent of the criterion.

9.1.3 Cleaning Prior to Use and Occupation

All new and existing ductwork that serves the building must have been cleaned in accordance with the recognised Standards, see the Guidance section. This includes all ductwork in the base building that serves the building from the air handling unit to the supply vents. If no ductwork exists, these requirements are deemed to be met.

Where construction management processes (see the ‘Responsible Construction Practices’ credit) are in place to ensure that all new ductwork, or ductwork that has been recently cleaned, remains free of moisture and debris until occupation, this ductwork can be considered to be clean. All other ductwork (existing and new) including plenums, filters and fan chambers must be cleaned in accordance with a recognised Standard.

Up to two (2) points are awarded where at least 95% of the nominated area is provided with sufficient outdoor air to ensure that levels of indoor air pollutants are maintained below acceptable levels.

For mechanically ventilated or mixed-mode spaces:

9.2A Comparison to Industry Standards & 9.2B Performance Based Approach

  • One (1) point is awarded where outdoor air is provided at a rate 50% greater than the

    minimum required by AS 1668.2:2012 as per 9.2A, or carbon dioxide (CO2) concentrations are maintained below 800ppm as per 9.2B; or

  • Two (2) points are awarded where outdoor air is provided at a rate 100% greater than the minimum required by AS 1668.2:2012 as per 9.2A, or CO2 concentrations are maintained below 700ppm as per 9.2B.

For naturally ventilated spaces:

9.2C Natural Ventilation

  • Two (2) points are awarded where the requirements of AS 1668.4-2012 are met. The nominated area must be provided with the quantity of outdoor air appropriate for the activities and conditions in the space.                                  The systems provided must not rely on its operation or adjustment by the facility management to achieve the required performance, the credit will only be awarded for permanent building attributes.

Demonstrating Compliance

Project teams must use one of the following three options for demonstrating compliance with the requirements for each space, depending on the ‘primary mode of ventilation’.

The primary mode of ventilation is defined as the ventilation system that is expected to operate for at least 70% of occupied hours. Standard hours of occupancy are defined as 50 hours a week or the building's design occupancy.

If no single mode of ventilation can be considered the primary mode of ventilation, a combination of methods is acceptable for demonstrating compliance.

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One (1) point is awarded where project teams demonstrate that pollutants from printing and photocopying equipment, cooking processes and equipment, and vehicle exhaust, are limited from the nominated area by either:

  1. Removing the source of pollutants, in accordance with 9.3A; or

  2. Exhausting the pollutants directly to the outside, in accordance with 9.3B.

A combination of methods can be used to demonstrate compliance.

9.3A Removing the Source of Pollutants

For this option, sources of pollutants, such as printing or photocopy equipment, kitchen stoves or vehicles, must be compliant with minimum emissions standards or not be present within the nominated area.

Where printing and/or photocopying equipment is present within the building, these must be certified in accordance with one of the following test standards:

  • ECMA-328;

  • RAL-UZ 171; or

  • GGPS.003.

For this option, specified sources of pollutants shall be exhausted directly to the outside of the project in accordance with a recognised Standard; and/or physically separated from occupants. The following requirements for printing and photocopy equipment, kitchen cooking processes and equipment, and vehicle exhaust apply.

Printing and Photocopying Equipment

All print and photocopy equipment must be located in an enclosed print/photocopy area that is exhausted directly to the outside, or to a dedicated exhaust riser. The exhaust system must not recycle air to other building enclosures, or to the return air duct of the ventilation system.

In shell and core buildings (or similar), the provision of the exhaust facility without enclosure will suffice, provided that information to the tenant is developed to ensure appropriate installation. || This information can be transmitted via the Building Users Guide or through a Soft Landings approach.

Each print/photocopy room must achieve a minimum exhaust ventilation flow rate. The fans must be installed as part of the base building; provision of the fans for future installation (e.g. by a tenant) does not meet the credit criteria.

Cooking Processes and Equipment

All kitchens must be ventilated in accordance with AS 1668.2:2012. A separate exhaust system must be provided for the kitchen exhaust. The kitchen must be physically separated from the adjacent spaces or have an opening no larger than an area of 2.5m2.

A ‘kitchen’ is defined as a space that includes cooking equipment such as stove tops or ovens, please see the Definitions section. Residential kitchens are not required to be physically separated, but must utilise either:

  1. A non-recirculating exhaust system, exhausting directly to outside; or
  2. A recirculating system, with filtration media that has been proven to effectively remove kitchen pollutants.

Kitchenettes or tea points with basic tea/coffee making or simple reheat equipment are not included. Cooking equipment employed for the preparation of food which has a power input less than 0.5kW/m2 may be excluded.

Vehicle Exhaust

All pollutants from vehicles in an enclosed space must be exhausted to a dedicated exhaust riser or directly to the outside, in accordance with Section 4 of AS 1668.2-2012. This exhaust system must not recycle air to other enclosures.

While enclosed carparks are typically considered tertiary spaces for the purposes of Green Star, this requirement is applicable where a combustion engine based vehicle (of all types) is parked or otherwise operated in an enclosed area which is within the project area, or where adjacent to primary or secondary spaces. Examples include an enclosed or underground carpark, a fire station, an aircraft hangar, a mechanics shop or a warehouse using forklifts.

In addition to the exhaust system, the space where the vehicle is located must be physically separated from the rest of the project, a door will suffice.

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