“1. This unit covers area up to 355 sq ft. Will it be safe to use it in the room which is 150 sq ft? 2. Do the windows have to be closed for the unit to work effectively?”

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• Yes, it will be great in a room that is 150 sq ft. We recommend the windows being closed so it can circulate the dirty air. If windows are opened, more and more particles would be coming in.

  Answered by Winix Product Expert 4 years ago

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• Windows should be closed or its going to smoke more.

  Answered by Beth 3 years ago

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