Booster fans do suck heed the warning folks. I bought a 250CFM booster fan for active air exchange, didn't even try to work I thought active air exchange was a joke.... I bought the fan I linked up there and with the speed controller I have to have it on 1/2 power when the lights in the flower side are out or it takes the veg side to 63F too... hehehe The good news is 1/2 is ok for lights on for the flower side too the two rooms are balanced.. The 49 RH is the room I just walked in and closed the door to take the picture.
No way would I use a booster fan on my cooltube, my cooltube is right on the cola of a plant right now lol I mean touching it that is the idea of a cooltube, you need good airflow that light system is 1000w 600w 1000w on a 465CFM hydrofarm inline fan
Point of my post is that I have screwed with booster fans they suck, steer clear! Anyone wanna buy one? lol
(Picture below shows balanced temp, 1 single 530CFM inline 6 inch fan on 50% works but before 1 x 250CFM booster fan didn't work at all. Rooms are 8x5 both sides, two 6 inch ducts with elbows painted black on the inside, this rooms are equal in size, they are 2 flower rooms during winter.)