ALSO, ...Another thought, I think my 4"(four inch) vortex fan is too weak to suck out enough hot air(probably why six inch ducts on lights and six inch fans seem to be most popular), UNLESS the air going into the tent is super cooled, and I improved on the idea of a plexi glass enclosure of the t5 light assembly. The problem with four foot(4') long t5 lamps, no matter how many bulbs, that the ends touch the ends of the grow tent that is four foot long(4'), cause I wanted to duct hot air on the ends but there is no room. Oh well, I'll find a way to improve on a t5 light setup somehow enclosing and ducting in time, hopefully, in the mean time I may have to order me some replacement equipment. I am sort of perplexed why I can't seem to get much use out of a 4" vortex fan setup, a lot of them get sold, I just thought it was okay for a small tent.
AND GOOD POINT ON THE INCOMING TEMPERATURE OF COOLING AIR, oh sure, I know I can go several routes, drawing air from the room as I do now with an air conditioner installed in that room, or also with air drawn from under the home, maybe switcheable depending on temperatures inside and outside, like in summer outside air may be too hot during some days of the summer.
IN OTHER EVENTS, TODAY I RECEIVED MY TWO TRIPPLE SETS OF PLANT PROTECTOR(ROOT PROTECTOR/ANTI MOLD/ANTI BUG, probably will be no time at all till my three triple sets of marijuana booster comes in, can't wait, I risk the plants everytime I guess at using miracle grow fertilizer powder. I think in two weeks time I will be growing competently with the proper setup at least for awhile till I work out my outdoor shed growing area dimensions and preparations. For right now, I want, maybe three tents in one room, or at least two, cause I am monitoring/watching nearly every couple hours, and all cause of heat, which has got to be solved in the next few days, I mean, if I have to do something temporary while waiting for different equipment, I'll take my kitchen portable air conditioner and install it in that room, or cut a hole in the floor in the closet/water tank room adjacent to get cool air from below.