Im doing a nutrient film hydro setup in my closet. The space is about 2x5x7. Im using a 400W HPS light. I need to ventilate this space but i dont want to cut any holes in the ceiling. Is there any suggestions of how i could vent this? I've grow with CFLs in soil in the same space and it stunk up the whole house, so i need to do something about the smell too. Any suggestions please, THANKS