Ez bro, what did you mean by "recirculating air will get you mould"? This is my 1st time using intake and extraction fans and I wanna make sure i'm doin it right. My last grow was in my outhouse in the garden so had plenty of fresh air thru cracks in the walls etc. However this grows inside so I'm gettin air out of loft straight from the chimmey breast, that sound about right?