Cheeseyfeet
Member
Hi ppl I have a grow tent that is 1.2 x 2.4 x 2 metres and currently have 2 600w hps power plant cooled light boxes my temps are good around 26c and humidity is fine around 50 I have a 5 inch rvk fan on my intake bringing cool air from outside and a 6 inch airforce taking the air out through the filter and heat away from the lights vented to outside my building both fans are running on a SMS 4.5 amp controller the intake is rated at 370metres per hour and the exhaust 450 metres per hour when I turn the minimal fan speeds up I start to get positive pressure if so the exhaust isn't moving the air quick enough there are no leaks and I need to run these fans quicker on hotter days to keep temps down has anyone had this problem or is it just a case of up rating my exhaust fan