Hello,
Of the three Thruwall fans we manufacture. The TW208P has the lowest airflow and also will be the quietest. The TW108 fan will flow the most air with the TW408 slotted between the other two fans.
The TW208P also is the only fan with an angled output grill. This allows the airflow to be directed up, down ans side to side. It also provides some privacy since the fan is difficult to see through.
Call us if you have questions about which fan is the best for your application.
Thanks,
Suncourt