In one of my threads Martin suggested using a small bath fan rated at about 4 watts to ventilate my off grid cabin. BC building  codes require a ventilation unit that runs 24/7 and I’m hesitant to rely on a fan that is basically enclosed inside the bathroom in order to ventilate the whole cabin.

Then someone mentioned a small commercial HRV in another thread.

https://www.canarm.com/hvac/heat-recovery-ventilators/light-commercial-single-room/hrv-micra-60.html

On the lowest setting it uses 4.2 watts (listed under “specifications) and can ventilate up to 650 sq’ (the size of my cabin. This unit should work, shouldn’t it?