It's always cool when I go into the bathroom and its always kinda warm in the shower. How can I reverse the exhaust fan? .....the vent with tape around it is the vent air comes out of the other is the exhaust fan which is the closest to the shower.
I assume you are somewhere hot and not in Canada. So your ac is on all day right? So you should remove the duct tape and the vent cover and attach some flexible round ducting from Home Depot to the ac vent- so it will start blowing cool air into the *bottom* part of your "shower curtain" Then keep the bathroom exhaust fan on constantly. This way, the cold central a/c air from the flexible ducting will be cooling the bottom of your growth area where your plants are growing. In other words you need cold air from the ac duct to be directly routed to the bottom of your bathtub.
Hot air rises.
The hot air from your grow lights will rise out the top of your shower and be exhausted out of the room because your existing bathroom exhaust fan is always on.
The way your room is now, The air-conditioner duct is 2 feet away from the exhaust fan so the cold air has no way to get to your plants at all :/
After you remove the ac vent cover plate (just two screws) you will probably see something like this metal duct register boot:
Go to Home Depot and buy the right size flexible duct looks like this:
One end of the flexible duct goes into the metal duct register boot, the other will lay in bottom of your shower next to plants. So they get cool fresh air regularly.
Make sense?