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Whirlybird Bunnings – Important Things You Should Know

The Solar Whiz roof ventilation unit allows the solar roof ventilation alternative to provide an array of benefits to homes that require roof ventilation. Seeing as this whirlybird alternative is 10-30 times more powerful than your regular roof whirlybirds, there’s no doubt the capacity the Solar Whiz yields will give your home the ventilation it needs.

whirlybird bunnings

Whirlybird roof ventilators are ineffective sources of airflow for your home.

Whirlybirds Price

Between the performance and capacity of the Solar Whiz roof ventilation unit, there’s no doubt that the value-for-money proposition makes the decision simple and easy. Is it really worth buying a cheap whirlybird if it does not have the capacity to ventilate your roof space?

The everyday approach to incorporating a successful roof ventilation solution into your home is installing a whirlybird vent. These are commonly referred to as roof vents, whirlygigs, air vents, roof ventilators, roof exhaust vents, roof fans roof turbine ventilators, roof extractor fans, whirlybirds, or simply a ventilator. For a serious and successful solution (which can be seen in the results Solar Whiz produces), your best option would be to install a Solar Whiz unit.

The roof ventilation product (whirlybird) has been around for a long time, however, its limited ability to move air out of the roof space, has, over the last decade or two seen more people looking for more powerful alternatives for increased efficiency.

Roof Ventilator Alternative

solara whiz roof ventilator an effective whirlybird bunnings alternative

The Solar Whiz roof ventilator referred to as a solar whirlybird takes roof ventilation/attic ventilation to a new level. Not only does the product range offer significantly higher airflow capacity than most powered roof fans available; it is also solely solar-powered and controlled – which means that it runs when required (i.e. when the sun is out) ensuring the roof is cooled by extracting hot air from the roof space at a much higher rate (10-30 times) than a whirlybird roof vent style unit.

Testimonial – Read what Greg Savill says about Solar Whiz.

“Over the last five years I have had two Whirly Bird units from Bunnings in my ceilings and have, so I thought, done a good job. I later did extensive research and was determined to find an alternative to the WhirlyBird. I then came across The Solar Whiz being talked about on several Whirlpool forums. I inquired about the units and found that there were three different sizes available.

As I have a split level house, with four levels and cathedral ceilings, I opted for the largest unit the SW3000, with a night control option and an adjustable thermostat.After installing the unit in the main lounge room myself (took approx 2hrs), I then removed the existing whirlybird and placed the Solar Whiz above the exhaust fan in the bathroom.

The unit started running immediately after removing it from the box and I could feel the air being pulled already!

The Solar Whiz has now been in for about six months and the temperature difference we have noticed is amazing! On hot days the temperature is about seven degrees cooler upstairs and dramatically cooler downstairs. If I close all the openings in the house and open one window down stairs, I can feel the air being pulled through the window and up the stairs to the top floor.

I have also noticed that there is minimal condensation on the windows since the installation. Also, the odours previously in the house do not hang around anymore and if we burn something in the kitchen the smell is gone within the hour! The night operation unit is a fantastic added extra as it allows us to pull cool air in at the night and we simply just set the adjustable thermostat and go to bed.

We do also have an excising air-conditioning unit and ceiling fans in the house, but rarely use it now opting just for the fans and the Solar Whiz. However, on the odd occasion that we do use the air conditioner, it does not have to work nearly as hard to cool the house as it did without the Solar Whiz.

The Solar Whiz is a great product and the team at GES have been so helpful and great at answering all my queries”.

—Greg Savill, Sydney NSW

Benefits of Installing a Solar Whiz instead of Whirlybirds

If you need roof ventilation to protect your roof space against moisture damage – running on solar helps ensure replacement air is relatively dry – whereas a wind-driven roof fan also will run in the rain, which could have the reverse effect and actually increase moisture levels in the roof.

Solar Whiz offers an option that allows you to ventilate the roof cavity after sunset, however, most of the job is done during the day. During the day, Solar Whiz roof ventilation units prevent heat from building up – whereas the whirlybird roof vent-style fan relies on the wind – or the build-up of heat in the roof space to start operating.  Few realize that the whirlybird roof ventilator relies on the expansion of the air in the roof space – triggered by high temperatures to start running.

Why does the airflow differ so much between roof ventilators?

Studies reviewing the performance of whirlybird roof vents that have been carried out show that the average wind-driven roof ventilator moves about 100 cbm/h – a small fraction of the air moved by even the smallest Solar Whiz unit.

Roof vent performance chart

In 2015 Solar Whiz introduced our new RAF range of roof ventilators. We broke with a long tradition in the industry, which conventionally has informed only the theoretical capacity of roof ventilators.
RAF is short for Real Air Flow – so when you are looking at buying a Solar Whiz unit – the airflow capacity stated is the actual maximum airflow the unit is capable of delivering.
At first glance, it may appear as if the RAF models offer a lower airflow when compared to our old range. However, we have simply taken a more realistic and useful approach to inform our customers about the airflow capacity of our products. The actual airflow capacity is based on the airflow with the restrictions an actual unit would have (such as the cap on the unit) when placed on a roof with sufficient replacement air available.

Most roof ventilation brands state their fan’s theoretical capacity with no restrictions (eg. the cap to the unit which is necessary for the ventilator to function) and not the whole roof ventilator unit’s capacity. This obviously gives a higher reading but is not applicable in the reality of the airflow capacity. Make sure you check what the actual airflow capacity is with the roof ventilation competition before you make your decision!

Do Whirlybirds Work?

As you can see from the above diagram – one whirlybird has a capacity of around 100 cbm/h without resistance (zero pressure differential). To achieve effective roof ventilation  – you must replace the air in the roof space 3/5 times an hour. This requires well-distributed access points for replacement air (e.g. eave vents) as well as a roof ventilator with sufficient capacity to compensate for the resistance the entry points and obstructions in the roof create for the replacement air, when the roof fan extracts the hot air. One or two roof whirlybirds-style roof ventilators will very rarely get you anywhere near the outside ambient temperature – as the capacity simply does not allow sufficient airflow through the roof. The roof ventilation capacity from the whirlybirds review clearly shows that a whirlybird roof ventilator is not an effective approach to roof ventilation!

Whirlybird Installation

solar roof vent installation by solar whiz

Whirlybird installation – is very similar to installing a Solar Whiz – and many of our dealers actually prefer to install the Solar Whiz – as it, unlike the whirlybird roof ventilator, does not require to be level adjusted for longevity – as the double-shielded ball bearings and high-quality brush-less fan motor ensures incredibly low noise levels as well as durability.

As the installation time and cost are similar for wind ventilators and Solar Whiz units – you will quickly find yourself ahead both performance and cost-wise, when installing a Solar Whiz roof ventilation system. Whirlybird price is no longer a major consideration – even though the price for one whirly vent is low – the total amount invested when installing whirlybirds in order to achieve adequate roof ventilation is higher for a whirlybirds-based solution.

Click on one of these links to see videos of how to install Solar Whiz roof vents for Tin Roof Installations and Tile Roof Installations

Printable instructions are available for Tin roof Installations or tile roof installations.

solar roof vent on a roof

Every new or old roof should be fitted with a Solar Whiz roof ventilator to allow for better air conditioning performance with reduced running time – as well as increased performance – whilst enjoying lower cooling costs when ventilating homes, offices, daycare institutions, factories, and warehouses.

If you are having work done on your roof or in your attic – make sure you replace your whirlybird wind-driven roof ventilator with a Solar Whiz to ensure optimum roof ventilation performance to increase your comfort and save on your cooling cost – at the same time!

Solar Whiz roof ventilation installation is as easy as a whirlybird installation to organise (or DIY) in any major city in Australia. We also cover many regional centers around Australia. Please refer to our dealer overview.

We have very detailed DIY instructions – or any roofing contractor, who does Whirlybird Installations will be able to install a Solar Whiz roof ventilation unit for you.


What about Ventilation for Commercial Properties?

solar commercial whirlybird on a factory

While we provide powerful solar roof ventilation solutions for your home, we also have a commercial ventilation line! We’ve designed them to properly ventilate the extreme heat that large-scale properties can produce. On top of that, our commercial exhaust fans are excellent at adequately ventilating fumes for industrial businesses. Our solar commercial ventilators come in two sizes:

the SW-RAF7000, capable of moving 7,000 m3/h (cubic metres of air),
and the SW-RAF10000, capable of moving a whopping 10,000 m3/h!

If you’re thinking of buying cheap whirlybirds to help ventilate your business, consider a Solar Whiz instead! You’ll be feeling the difference during those hot summer days.





Contact Solar Whiz for a whirlybird bunnings alternative price today!

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