# IEQ 2.3 Ventilation - Non-Residential
# Applies to
All non-residential development
# Objective
To provide fresh air and passive cooling opportunities.
# Summary
This is a mandatory credit. A minimum score of 33% is required in this credit to pass the IEQ category.
Points are awarded as follows:
There are three approaches in this credit. Each approach can contribute a maximum of 50% to the credit score, and approaches b) and c) combined can contribute a maximum of 50% to to the credit score.
a. Natural ventilation
Where a minimum of 60% or more of the regular use areas are effectively naturally ventilated.
Additional points are awarded where a higher proportion of the regular use areas are effectively naturally ventilated.
Maximum points are awarded where 100% of the regular use areas are effectively ventilated.
b. Outdoor air
Where an increase in outdoor air (in L/s) of at least 50% above AS 1668.2:2012 is available.
Additional points are awarded where a higher increase in outdoor air (in L/s) above AS 1668.2:2012 is available.
Maximum points are awarded where an increase in outdoor air (in L/S) of 100% above AS 1668.2:2012 is available.
c. CO2 concentration
Where the ventilation systems are designed and monitored to maintain a maximum absolute CO2 concentration of 800ppm.
Additional points are awarded where the the ventilation systems are designed and monitored to maintain a lower CO2 concentration.
Maximum points are awarded where the ventilation systems are designed and monitored to maintain an absolute CO2 concentration of 500ppm or lower.
A combination of these approaches can be chosen to achieve the maximum 100% credit score.
Effective cross flow ventilation
- A breeze path between 2 ventilation openings either within the room or from one room to another.
- Breeze path length less than 15m measured between ventilation openings and around internal walls, obstructions & partitions.
- Areas within 5m of a straight line breeze path, in line of sight of the breeze path and within the same room as the breeze path can be included in the area considered effectively naturally ventilated.
- Ventilation openings located either in opposite or adjacent external walls or an external wall and an operable skylight.
- Size of ventilation openings greater than 2% of total floor area or 1sqm, whichever is greater. The opening is the maximum allowable clear open area for the window. ie if floor area of room is 55sqm then clear open area of window / door must be at least 1.1sqm.
- No more than 1 doorway or opening <2sqm between the ventilation openings.
- Where the breeze path travels through an internal door, that door must be provided with door catches.
- If on adjacent walls, ventilation openings must be at least 3m apart at their closest point. This is to ensure the space has reasonable ventilation throughout and not just in one corner.
- If relying on a courtyard adjacent to a ventilation opening the courtyard must have a minimum depth of 3m from the window or be a minimum size of 9sqm.
Effective natural single-sided ventilation
One of the following:
- Maximum permissible depth of room 5m with separated openings high and low or split across the width of the room/facade, each 5% of the floor area.
- Total area of openings should be a minimum of 30% of floor area.
# Documentation & evidence required
- For effective natural ventilation, floorplans with compliant areas marked.
- For outdoor air greater than AS 1668.2:2012, calculated requirement and proposed outdoor air provisions.
- For CO2 concentrations, proposed approach to achieve this air quality and details of monitoring and control.