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An air purifier that does not use electricity or energy of any kind is merely a filter. Filters block dust, pollen, and other allergens from getting into places where they shouldn't go. Since they have no way to draw in air, they rely on outside fans or the wind to help them filter the air.

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12y ago

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What are fluid power systems that use air or another gas?

pneumatics


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What is a pneumatic fluid?

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What source of energy does air conditioning use?

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