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Testing by Complex Air Conditioning Pty Ltd, and reviewed by the
Victorian Sustainable Energy Authority, indicates that in areas
where ceiling exhaust fans are in use this can give an energy
saving of up to 30%
Test results concluded that in Winter conditions with an outside
temperature of 1ºC and an average internal room (10m x 4m x
2.7m—volume 108m³ and an ambient internal temperature of 15.5ºC),
the cold air inflow from the roof cavity through an unsealed fan
into the room was measured at 13 litres / second.
This means that in every hour 46.8m³ of cold air would have
entered the room and the total volume of warm air would be replaced
every 2 hours and 20 minutes at a huge reheating cost.
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