We have an unused trailer. We want to use the back room as a grow room. My plan is to partition off a corner in this (10x10) room and use reflective vasqueen plastic to create a new enviroment. I suppose we'll have to splurge on an portable air-conditionining system to heat and cool this area(this trailer has no power) and we'll use an oscillating fan to circulate the air. But, what I wonder is... can I use an air purifier to keep the air fresh instead of setting up all this ventilation? Thing is, I don't have alot of money and maybe I don't have a good understanding on ventilation. If anyone can clear this up for me as soon as possible it would be appreciated by me and lovely little strands of white widow.