Q. How many vents do I need?
A. We recommend that one vent be installed for every 90m2 of roof space. It is also important to remember to allow the air to be replaced from somewhere, and so we recommend 4 eave vents per roof vent, and ideally one internal ceiling grille, to allow any hot trapped air to escape from inside your home.
Q. How much will ventilation actually cool my house?
A. Given the variables inherent in house designs, it is impossible to provide precise guidance on what will happen to indoor room temperatures. However we do know that roof space temperatures can rise as high as 70°C, and vents can easily reduce this by 20-30°C, thereby reducing the heat loads on your ceiling insulation and any air conditioning ducts running through the roof space.
Q. What happens if there is no wind, do the vents still work?
A. If the air in the roof is hotter than the ambient air outside, then the vent will allow that air to escape and help reduce the attic temperature.
Q. Will my natural ventilator work if there is no wind?
A. Yes, a large proportion of the flow generated by a natural ventilator during the day is caused by a phenomenon known as 'Stack' effect. This is basically the process of hot air rising.
Q. Are the vents noisy?
A. Edmonds natural ventilators are designed to run silently. The Edmonds powered ventilators are designed to run as quietly as possible, but depending on installation location may be audible to the home occupant.
Q. Some of the Edmonds vents are made of plastic. Will this be a problem?
A. Plastic Edmonds vents are extremely strong and have been independently tested to withstand wind speeds in excess of 216 km/h. Edmonds ventilators that are made from plastic are made from high grade engineering polymers, such as ASA polymers (Acrylonitrile Styrene & Acrylate). ASA is used for the majority of Edmonds housings, whilst Glass filled nylon is used for structural components. The plastic Edmonds use is designed for long life under Australian conditions and are UV stable.
Q. Can the whirlybirds withstand Strong winds?
A. Edmonds plastic vents are subjected to the same tests as our metal vents and are designed with quality and performance as the primary concern. The SupaVent for example can withstand wind speeds in excess of 216 km/h.
Q. Will the vents make my house look like a factory?
A. The Supavent and clear TurboBeam are much more aesthetically appealing options for your home. They are both much less obvious on the roof. We also suggest that if vents are positioned just below the ridge line on the rear of the house, where possible, they will not be noticeable from the street.
Q. How do rotary ventilators work?
A. Rotary ventilators allow hot air to escape from your roof, irrespective of prevailing wind. When wind is present, rotation of the top will boost the air extraction rate. Rotary ventilators take advantage of pressure differentials, which are either caused by temperature differences or wind.
Q. What if I don’t want lots of vents on my roof?
A. The AiroMatic is the ideal product for larger homes – it is equivalent to installing 6 naturally powered vents. Selecting a ventilator from the Edmonds powered roof ventilator range allows for a much greater flow rate per vent and as a result reduces the number of vents required for adequate performace.
Q. What does a high specific flow rate mean (m3/hr/W)?
A. The specific flow rate allows for an easy value comparison to alternative products. It's simply the air flow rate per 1 watt of power consumption. The higher the number the more air flow generated by the fan per 1W of power used. It is important to also judge the product by the total flow rate as this is the number required to solve many ventilation problems. Installation Questions
Q. Will I need an electrician to install an ecoFAN or Maestro?
A. Both products require a standard power point to plug in the transformer, often a power point can be reached within close proximity of the installation, therefore eliminating the need for an electrician. Where no power point is available, an electrician would be required to install one first.
Q. Can ventilation be installed on both metal and tiled roofs?
A. Yes, the Edmonds roof ventilators are designed to be installed on both metal and tiled roofs. The flashing supplied is suitable for use on both metal and tiled roofs. Q. Which side of my house is best to position the ventilator unit? A. When possible the ventilator unit should be installed on the prevailing wind side.