Here are two articles about ventalation from the Overgrow FAQ.
You will need to perfect this before you put your girls to flower as then you will have to have those doors closed at plant night. Also, if say you have guests for a few hours, how will your plants do with those doors closed? They will cook. The better you have this set up now, the better it will be for the girls in the long run. Please read anything you can find on ventaltion as this is one of the most frequant causes of distressed plants, overheating.
Ventalation How much Ventalation?
Grow temps for pot should be 78F llights out can be 10 degrees less aprox. My lights out temps as I am growing in a cold room go down to the 50's but this is not ideal. This is not written in stone.