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Roger Big is suitable for rooms of up to 1100 square feetand changes the air 3 times per hour. For heavily contaminated room air and for allergy sufferers, Roger big is recommended for rooms of up to 670 square feet–with an air change rate of 5 times per hour. Roger Big shows the quality of the room air. He continuously measures the quality of the air with his sensors. The air quality indicator lets you know if air quality deteriorates by changing its colour (blue = good, orange = medium, red = poor). The textile pre-filters remove coarse dust particles and pollutants from the air. By doing this, they protect the two Dual Filters™and prolong their service life. The integrated Sanitized®* hyg