wow this site is good for advice!!!
The PC fan should be fine, just look to see if you can see the leaves moving from the air or see if you can feel it around then.
I use a larger size PC fan and have it set to come on for 20 minutes and off for 20 minutes all day.
Information about fans in grow cupboards on the internet will talk about using them for air circulation but also for keeping the heat down because of hot lights.
If you have a thermometrer and the temp is stable then a small fan is fine for moving the air around and circulation. You want to get fresh air in too, and not just keep the door closed all the time and move the same old stale air around.
The PC fan should be fine, just look to see if you can see the leaves moving from the air or see if you can feel it around then.
I use a larger size PC fan and have it set to come on for 20 minutes and off for 20 minutes all day.
Information about fans in grow cupboards on the internet will talk about using them for air circulation but also for keeping the heat down because of hot lights.
If you have a thermometrer and the temp is stable then a small fan is fine for moving the air around and circulation. You want to get fresh air in too, and not just keep the door closed all the time and move the same old stale air around.