2024 HCA Design Guidelines

Ventilation Section Summary Spaces are to be naturally well ventilated in order to minimise reliance on mechanical ventilation wherever possible. Ventilation Considerations Checklist: • Natural cross ventilation and ceiling fans should be employed as the main form of ventilation. • Provision of habitable rooms with a minimum 2.7m in floor to ceiling height to enable the inclusion of ceiling fans. • Location, size and type of operation of operable windows to maximise cross ventilation to dwellings. • Provision of external lockable security doors and external flywire screens to all operable windows provide for secure ventilation. • The requirement for active heating and cooling is to be minimised. In all cases, energy efficient and cost-effective methods which provide minimal running costs, should be employed. • All mechanical ventilation should be exhausted externally and have self- closing dampers.

E1.03

Indoor Environment Quality (IEQ) Section Summary Design and systems should maximise indoor air quality.

E1.04

Indoor Environment Quality Considerations Checklist: Consider the following items when looking to increase indoor environment quality: Indoor Air Quality • Eliminate entry of outdoor pollutants • Provision of outdoor air • Consider impact of Volatile Organic Compounds (VOCs) that can be released from applied coatings, finishes and other materials and can negatively impact Internal Air Quality

Acoustic Comfort • Acoustic separation

Visual Comfort • Daylight • Views to the external environment/ outlook

Indoor Pollutants • VOC off-gassing: paints, adhesives, sealants and carpets. • Formaldehyde off-gassing: Engineered Wood Products.

• Microbial control - Legionella impacts from cooling systems. Refer to Section D2 Mechanical for additional requirements for air conditioning.

Thermal Comfort • Average NatHERS Rating of 7 Stars (as per overarching requirements)

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Housing Choices Australia | Design Guidelines

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