Im kinda havin the same issues as you are so maybe we can work them out together, I have 6x1ooo watt HPS so we're @ the same wattage.
as for carbon filters, they need to be used properly to work properly. I dont think humidity affects it, but I know the speed that air flows through it does. pretty sure they are only supposedto be used @ 2/3 to 3/4 cappacity to get 100% of the odor absorbed.
does this help?
Suspectelite Reviewed by Suspectelite on . Venting q Dear guys I have a little trouble in my head. 10 hps by 600watts in my grow room, and couple of powerfull inline fans for suckin air out of the room. The whole construction is running under test now. The problem is: when fans are on the humidity in the room falls to a level with out side air (air passively sucked in to grow area from a living room next to it), when fans are off the temp is rising. What can I do about it? The flowering stage will demand big carbon filter and I warrying about Rating: 5