Be aware that even though the motor is not in the direct air flow that odors from the motor will still mix with the clean air.   If you are sensitive to chemicals and odors then expect to off-gas Airpura machines for 2 months before using.   To off-gas, I ran it in the garage without the filter and the odor was so bad I could smell it in the house.  The factory assures me that the same motor is in all of their machines.

The factory refused to admit there is a problem, cannot return without a restocking fee.

Works nicely once it is off-gassed.