Thinking of installing a Whirlybird roof ventilator?
Why would you?
Solar Whiz offers all the benefits of a Whirlybird roof ventilator, but has 10-30 times the ventilator capacity and similar installation cost.
The most common approach to ventilating the roof space is to install wind driven roof ventilator – commonly referred to as Whirly Bird, whirly gig, air vent, roof ventilator, roof exhaust vent, roof fan, roof turbine ventilator, whirlygig or simply a ventilator. If you are serious about roof space ventilation and reducing the heat load on your home – we suggest you have a good look at the Solar Whiz.
The roof turbine ventilator type of product has been around for a long time, however, it’s 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
Benefit of Installing a Solar Whiz instead of a WhirlyBird
If you need roof ventilation to protect your roof space against moisture damage – running on solar helps ensure replacement air is relatively dry – where as 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.
Of course Solar Whiz offers an option to allow ventilation of the roof cavity to continue after sunset, however, most of the job is done during the day. During the day, Solar Whiz prevents heat from building up – whereas the whirlygig style fan relies on the wind – or the build up of heat in the roof space to start operating. Few realize that the “whirlygig” relies on the expansion of the air in the roof space – triggered by high temperatures to start running.
Whirlybird Review for Performance of Major Roof Ventilators (Whirlygig)
Studies reviewing the performance of whirlybirds been carried out showing 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 (SW1400).
As you can see from above diagram – one whirly bird has a capacity of around 100 cbm/h without resistance (zero pressure differential). In order to effectively ventilate a roof space – 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 fan with sufficient capacity to compensate for the resistance the roof creates for the replacement air, when the fan extracts the hot air. One or two whirly gig style vents 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 Whirlybird review clearly shows that Whirlygigs are not an effective approach to roof ventilation!
As the installation time and cost is similar for wind ventilators and Solar Whiz units – you will quickly find yourself ahead both performance and cost wise, when installing a Solar Whiz. Whirlybird price is no longer a major consideration – even though the price for one whirlybird is low – the total amount invested when installing whirlybirds in order to achieve adequate roof ventilation is higher for a whirlybird based solution.
Click on one of these links to see a video of how to install a Solar Whiz:
Printable instructions can be seen using these links:
You can also download the Solar Whiz installation instructions by clicking here
If you are having work done on your roof or in your attic – make sure you replace your wind driven roof fan 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 installation is as easy as Whirlybird installation to organise, if you are in any of these locations:
Solar Whirlybird Installation:
Brisbane, Gold Coast, Sunshine Coast, Central Coast, Sydney, South Coast, ACT, Melbourne, Adelaide, Perth.
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 for you.