ALLVENT UF312> 190watt exhaust plenty of air movement, it nearly sucks me in when i stand to close lolrealy...you know what fan he has then???...dont know why people guess
well obviosly you wouldnt go and put 4 1000watt lights in a 2mx2mx2mput it in there and turn it on and add plants...is only way anyone knows. we dont live with you so all will be a guess.
allvent 312 is 300mm 190 watt airflow 450/L secondok so you show a huge wattage fan but what cfm...or is that the cfm and not watttages.
ok room is 200 cubic feet. then need to add for hose lenghts and heat from lights. so about double the room cfm. id at least recomed a 450 or so cfm fan, or id think id see heat issues.
multiply the width by length by hight. that shwos what cfm the room needs. to start with, thhen the lighting and hosing adds more