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	These are six samples of RtR fan by computer, we called them computer sketches

This is a wholly new concept aimed at lower-middle class who cannot afford to purchased air-conditioning units for the entire house. This concept requires two electronic products: Air-conditioning, as the element producing cool air in the air conditioned room, and the Exhaust fan, as the element distributing cool air to the other rooms without air conditioning system. Therefore a new design for the exhaust fan is required to make it appear "homy" and acceptable to be used in every rooms.