I'm trying to find some fans to cover my MASSIVE grow space. The math for finding the CFM i need is freaking me out though. Can someone double check me? Here are the dimensions of my massive space: WxHxD 16"x18"x8" (in inches... huge, i know) So in order to get the cubic feet, i divide all my dimensions by 12 and then multiply them together? (16/12)x(18/12)x(8/12) i get ~1.4^3 So at a minimum I only need a fan to cover 1.5CFM? A 60mm fan @12CFM would clear the space 8 times per minute? What am i missing? Why do i feel like i need more fans?