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> The result is a leaf blower that emits just 45 decibels of noise at 50 feet and full throttle.

"full throttle" here means half the normal CFM I bet.

The article says based on measurement of Whisper Drive thrust it moves more air than a handheld leaf blower.

Handheld ≠ backpack which is what professionals use.

Volume of air is only part of what matters, the other is pressure. Pressure tends to make noise.

They give those numbers too.