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     7 years ago 

    Thanks! They are commonly available, and are reasonably priced. There is a TED Talk done in Delhi India, that talks about it Here's the link: https://www.ted.com/talks/kamal_meattle_on_how_to_grow_your_own_fresh_air

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     7 years ago 

    Thanks For link.

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     7 years ago 

    Hope it helps

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