Sorry I have slow to reply but I have been...
drinking and partying, Ahem, I mean working my ass of for my employer, in New Orleans.
I have never tried positioning the holes other than centered, or equally spaced on each side. The nozzle distributes air flow pretty equally, so the small boost provided by the holes is enough to keep the fan turning, which keeps the brush spinning, and the spinning brush transfers torque back to the fan to keep it turning. The spinning agitator allows the nozzle to take in more gulps of air as the carpet is pushed down and sucked back up. It is such a small change that makes such a huge difference.
drinking and partying, Ahem, I mean working my ass of for my employer, in New Orleans.
I have never tried positioning the holes other than centered, or equally spaced on each side. The nozzle distributes air flow pretty equally, so the small boost provided by the holes is enough to keep the fan turning, which keeps the brush spinning, and the spinning brush transfers torque back to the fan to keep it turning. The spinning agitator allows the nozzle to take in more gulps of air as the carpet is pushed down and sucked back up. It is such a small change that makes such a huge difference.