Control ERV based on AQI Sensor

I really struggle with using Rule Machine...I feel like it has a steep learning curve for some reason.

Anyways, I have a PurpleAir Sensor (integrated with HE already) to measure the air quality in our house. When one of the values reaches 45, I want to switch on our ERV (it's already a switch in HE). I then want it to turn off when the value reaches 15. I don't want it to turn off if the Master Bathroom fan is on however. (I have a rule that turns on/off the ERV according to that switch state.

Should I combine these into 1 rule? How would it look? The custom attribute used for the sensor will be aqi10.

I don’t have either of these devices but this is what I’d do based on what you wrote.

Don’t feel bad about not getting rule machine. This type of thing is hard to learn as it is. The user interface of rule machine isn’t helping at all.

Ninja edit, I missed a logic step in there. Updated.

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Thank you, this is helpful. I know I'm missing something, but I cannot put my finger on it.