"Passive renewable energy" measures, such as using natural ventilation to cool a building and spacing windows to maximize the sun's light, are other ways to slash a building's electric bill.

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Fire brigade crews used their ventilation systems and were first into the building to douse the flames before Green Goddess crews aided the evacuation.

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Yeang's designs use walls of plants, scallop-shaped sunshades, solar panels, advanced ventilation and the structure and of the building itself to collect water and catch cooling air currents.

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Rupert said the same chlorine dioxide treatment will be used on the building's heating, ventilation and air conditioning system (HVAC), where spores had been found after the letter was opened in Daschle's office.

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However, the most important aspect of this expansion is that it will allow Johnson Controls to address the growing demand for energy-efficient HVAC (heating, ventilation, and air conditioning) products from the building market in China.

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In his brilliant 1991 design for Frankfurt's Commerzbank, the tallest office building in Europe, he brought off the seemingly impossible feat of building a supertower that could use natural ventilation (as against fuel-gobbling air conditioning) during 60% of the year.

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The building draws on the bumbung limas roof design, shading the walls and allowing natural ventilation.

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