there are vents? on top of the brush roll housing, is this to prevent clamping down from suction or is it also for some freshener tablets/ essence of some kind?
Got its first real workout yesterday on the landlady's old THICK white plush, normally I only use the concept 1 there, others have no effect. The Royal out cleaned? in my mind the concept. I could feel it beating, carpet was more brushed up and lifted and it almost pulled itself forward. Impressed!