Hey all I have a problem with my ventilation. I have a grow room under the base of my house and it is by far the best location for it because of the darkness and the stealthy location. This is great! But I have one problem, I only have one entrance through a 2x2 hatch in my closet to get into it. I am using fans currently to circulate all bad air out of their (One pointing up through the hatch and another blowing out the door, all windows are open to circulate air through and out of the house.) Am I going to be okay having just one entrance? I was thinking I would cycle air in and out using the fan for 12 hours blowing out and the other 12 blowing in? Will this work? Or do I just need to buck up and dig a 4 foot hole under the house? Is it going to severely damage my plant growth if I do this instead of having two entrances? Thanks guys!!