Radonaway GP fans are high suction low flow fans to be used with tight soil conditions.
The GP201 is a medium suction fan rated at 1.8"WC. Power rated at 40-60 watts. Usually used with 3" PVC duct. This could be a good choice when gravel is found under the floor and with a small basement....<1000sq/ft. Also good for activating a 3" passive vent in a small basement.