The RN3 (formerly HP220) model is a very powerful fan.
340 CFM at 2.0 " water column.
Max air flow is 377 cfm and a 141-watt fan.
Fantech's RN series fans are designed explicitly for radon mitigation systems. The fans are sealed tight to reduce re-entrainment risks, and the motors are built to run 24 hours a day, every day.
This fan is approved for indoor use which is important in Canada's cold climate.
The fan is assembled in the USA, and the motor is made in Germany
5-year manufacturer warranty.