Requesting exhaust and humidity control tips in mushroom fruiting room

I have poked around in input/output/function settings, and haven’t quite figured this out yet.
I am running an exhaust fan to remove CO2, and a humidifier to increase RH. Is there a way that I can have the humidifier kick on for a pre-determined amount of time every time the exhaust fan kicks on? I just want to give a boost to humidity in the room knowing that some of it is about to leave through the exhaust fan.
-Cheers and happy tinkering!