transcend micro

I got a new transcend micro. even though i have the ezex feature turned off it sounds like the fan goes up and down when i inhale/exhale. anyway to make it consistent? is this normal with this unit?

All CPAP units run the motor up and down... they have to to keep a constant pressure when you're inhaling and exhaling. The best units do it so quietly you can't hear it. Travel units are not the best units.