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architectural notes



Solar Powered Fans myth and marketing deception

Solar powered fans are rated according to fan displacement at maximum speed in free air conditions

That is a fan in a tube, with nothing on top and nothing below, at maximum speed which would be ostensibly at full light and driven not necessarily by the solar panel accompanying the fan as a product.
The minute the flow encounters resistance, like the cap on a solar fan roof ventilator or the free air available on the intake side, performance values are decimated when compared to those claimed. Add the variances of light available on the day you can reduce those ratings further again until they are only a fraction of what is claimed.

The solar panel is the energy side of this equation so look at the life expectancy as claimed by the manufacturer or the marketing company. There's no point to going to the trouble of installing the unit just to find some months later that you have is a solar powered frittata because if the warranty doesn't cover the labour you're going to be up for the same costs again and again....or until you fall off the roof.

And after all of that don't have a roof ventilator that works at night....which is when you really need it for the evening purge.

In the meantime they've got your money and you have an education such as it is because like as not, an education always comes at a cost and this is where the calibre of teacher sought is important.

Now you might say it shouldn't be allowed, and even if the performance testing parameters were defined on the packaging, very few would understand them.

So it's Buyer Beware.....more so as time passes


keeping cool

Wikipedia /Cupola

The Cupola

Air Conditioning Summer Cooling
Architect or Building Designer
BAL Fire Risk Roof Ventilation
Bathroom Ventilation against mould
Buying a Roof Ventilator
Buying Roof Ventilation
Conjecture & Supposition
Cooler Home with natural roof ventilation
Does Roof Ventilation Work?
Ductless Range Hood
Evaporative Air Conditioning
Flue system for combustion stove
Ignorance sells ventilation best
Mould Spores in your home
Overhead Sweep Fans
Ridge Vent
Roof Services Industry
re roof ventilation
Roof Ventilation Fans pt1
Roof Ventilation Fans pt2
Roof Ventilator Choices
Roof Ventilator Comparison
Roof Ventilators Explained
Solar Powered Ventilation
marketing deception
Solar Roof Ventilation
Steel v Tile Roof
Sub Floor Ventilation
The Evening Purge Cycle explained
The Ventilation Flim Flam man
The Ventilation Specialist
To ventilate and sleep well
Ventilating a cathedral ceiling
Ventilating a raked ceiling
Ventilating Bedrooms
Ventilating your home with Ceiling & Wall Vents
Ventilation Concepts
Ventilation of a Skillion Roof
Ventilation of Indoor Pools and Spas
Ventilation v Insulation
Venting a Smoking Fireplace
Venting the top floor
Venting under a skillion roof

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