Natural Ventilation in NSW Classrooms: The Glass-Louvre Case for Healthier Schools
Australian research keeps reaching the same conclusion: the way we ventilate classrooms shapes how children learn. The newest data from New South Wales makes the point harder to ignore — and exposes a contradiction sitting inside the state’s own school design rules.
In June 2026, the University of NSW and the Department of Education released the Clean Air Schools study — air-quality sensors installed across 59 schools in Sydney, Newcastle and Wollongong. The findings: most classrooms exceeded the 850 ppm CO2 threshold at some point during the school day, and almost a third weren’t at levels considered optimal for learning most of the time. The classrooms that fared better shared a feature the study singled out — natural cross-ventilation. Where air could move, CO2 fell.
Giving evidence to the NSW Parliamentary Inquiry into Clean Indoor Air, Adjunct Professor Geoff Hanmer put it starkly: peak levels in classrooms are measured to exceed 3,000 ppm CO2 on a regular basis — far above the 800 ppm goal set by many regulatory bodies. At those levels, concentration drops, drowsiness rises, and learning suffers.
The contradiction in the NSW school rulebook
Here is the part that should give every specifier pause. The Department’s School Infrastructure Pattern Book — the standardised template now shaping new NSW public schools — lists the “elimination of glazed louvres” as a non-negotiable baseline design element. The very device the study shows delivers cross-ventilation has been quietly designed out of the standard classroom.
Yet the Department’s own technical standard tells a more nuanced story. EFSG 0451 (Windows and Glazed Doors) — current in the EFSG 2025 Technical Standards — sets out at clause 0.11 that glass louvres can be used with Department approval, and that, when approved, they should preferably be the security type with metal surrounds, incorporated into the window suite with careful detailing to ensure watertightness. The pathway exists. The standard simply asks for an engineered louvre, not a cheap one.
Engineered louvres already answer every objection
The clause’s reservations — vandalism, poor sealing, watertightness, unsuitability for laminated glass — describe generic glass-on-glass louvres, not engineered systems. A performance louvre answers each:
- Laminated safety glass as standard — the glazing type EFSG glazing rules mandate, while toughened glass is discouraged.
- Air infiltration tested to 0.12 L/s·m² (AS 2047) — sealing far tighter than generic louvres.
- Water resistance to 800 Pa and structural performance verified to NATA-tested standards.
- Integrated security bearers that allow safe ventilation around the clock — no bolt-on grille required.
The ventilation maths that makes louvres decisive
NSW general learning spaces target 6.25% of floor area as openable free area — 25% above the national 5% minimum, reflecting AS 1668.4’s higher allowance for rooms full of under-16s. That’s roughly a 4.3 m2 ventilation panel per classroom. Because a performance louvre opens to up to 86% free air, it hits that target with far fewer, smaller openings than awning or sliding windows fitted with security mesh — lower installed cost, more genuine airflow, and less facade given over to glass.
From passive opening to intelligent ventilation
The next step is automation. Safetyline Jalousie’s SmartAir system — recognised with an Australian Good Design Award — turns the study’s finding into engineering. Louvres open automatically when CO2 rises, lock out the air-conditioning while they ventilate, and close on rain or wind sensing, with overnight purge cycles to flush the building before students arrive. It is cross-ventilation that manages itself — exactly what a classroom hitting 3,000 ppm by mid-morning needs.
Already proven in NSW schools
This isn’t theoretical. At Arthur Phillip High School in Parramatta — the state’s first high-rise public school — more than 2,000 m2 of performance louvres in banks up to 1.4 m wide by 3 m high delivered the largest free-air area of any window type, while meeting fall-prevention and balustrade compliance across every floor. At Bella Vista Public School (TKD Architects with Lipman), louvres were chosen for 40 classrooms because they seal six times better than glass-on-glass when closed and open up cross-ventilation when needed. Across nearly 500 educational facilities nationally, the same pattern holds.
The window worth specifying back in
The evidence, the standard and the technology now point the same way. The Clean Air Schools study shows cross-ventilation works; EFSG 0451 cl. 0.11 keeps the door open for engineered glass louvres; and SmartAir makes that ventilation intelligent. The only thing standing between a healthier classroom and the status quo is a baseline template that removed the louvre before the data arrived.
Specifying a performance louvre system on your next NSW school project is a documented departure, not a dead end — and SafetyLine Jalousie will support it with the test evidence, approval pathway and precedent to make the case.
Talk to us about a ventilation review for your project, or request the EFSG compliance pack. Contact us
