Airocle’s natural roof ventilators are built to withstand even the most demanding of environments. With a growing number of requests for natural ventilation in remote and regional areas where cyclones are commonplace, Airocle has embraced the importance of both the Building Code of Australia (BCA) and the Northern Territory Deemed to Comply Manual (DTCM) and have engineered our roof ventilators accordingly.

This means that even if you live in a highly cyclone-prone area of Australia, you can relax knowing that your Airocle natural roof ventilator will last the distance — even through the toughest of storms.

Deem to Comply and Approved in Principle

One of the challenges that builders and architects face is designing a natural ventilation system that will survive in a certain wind region.

The first point of reference in terms of designing for cyclone regions is the Building Code of Australia. Part 3.10.1 High Wind Areas outlines the structural and design requirements for building designs. The Northern Territory Deemed to Comply Manual (DTCM) has been referenced as an acceptable construction manual for high wind areas in the Building Code of Australia since 1996.

Our natural ventilators have been engineered in response to the Deem To Comply assessment by the Northern Territory Building Advisory Committee Assessment, and the Approved In Principle certification process by Northern Territory structural engineers – ensuring the integrity and performance of our ventilators in even the most challenging environments.

This ensures that your building will be fitted with a natural ventilation solution that offers the triple advantage of compliance, performance and the integrity to survive the next cyclone that reaches your project.

Wind Regions

Australia’s wind regions are generally divided into four sectors.

Region A is Normal, and applies to most of the interior of Australia (including Tasmania).

Region B is Intermediate and covers a band of the coast from just north of Perth, up the west coast, along the north coast of Australia, and down the east coast of Queensland extending to Coffs Harbour.

Region C is Tropical Cyclones, and is a narrow band which starts a little inland near Carnarvon on the west coast, through Darwin and around to Bundaberg on the east coast.

Region D is Severe Tropical Cyclones — a narrow coastal band from Carnarvon to halfway between Port Hedland and Broome on the west coast.

Cyclone Categories

Cyclones are categorised according to strength, from Category 1 (the weakest) to Category 5 (the strongest).

As part of the external structure of a building, natural ventilators are relied upon to withstand the strong winds and rain of a cyclone, to ensure the integrity of the building and roof structure.

CSIRO testing and dedicated in-house engineering for cyclone regions means that you can rely on a natural ventilation system that will withstand and perform in even Category 5 events, providing the roof is still in position.

CategoryWIND GUSTSocean swellsdamage
1Up to 125km/h1.2 – 1.6mSlight DamageTrees and farmland damaged
2126 – 169km/h1.7 – 2.5mSignificant damage to buildings and other structures
3170 – 225km/h2.6 – 3.7mVery Destructive – Structural damage. Likely power failures
4225 – 279km/h3.8 – 5.4mVery Destructive – Significant roofing and structural damage
5Above 280 km/hMore than 5.5mVery Destructive – Almost total destruction and extremely dangerous

Proven Performance

Airocle products and natural ventilation systems have survived some of the most notorious cyclone events in Australia’s history.

CycloneWind speedsStatus
YasiUpto 300 km/hSurvived
LarryUpto 240 km/hSurvived
TracyUpto 250 km/hSurvived
IngridUpto 325 km/hSurvived

We have often found our roof ventilators in cyclone-affected regions still spinning smoothly after a storm — which provides you with the reassurance that our natural ventilators are built to last.

Airocle only delivers quality manufactured ventilation solutions. Our natural ventilators relieve the pressure placed on a building’s roof during a cyclone, and can be the difference between a building that is greatly damaged and one that survives.

Let Us Help You With Natural Ventilation Design

Whether you are an architect, builder, building certifier, designer or engineer, we would be happy to help you understand the requirements for cyclone regions. We can help you design a natural roof ventilation system that will perform even in the most demanding of conditions.

If you are uncertain of the requirements you need to meet for the wind region in which you are building, or would like some advice on roof ventilation compliance and design, contact Airocle on (02) 4677 7300 — we’d love to talk with you!