Mothperson
Member
First time grower here, just some things I wanted to note in case anyone running a cheap setup in a closet has the same problem I had. Humidity in flower was averaging around 70°F and up as high as 80°F for me. I'm running a closet grow and was bringing air in the tent from the closet, but keeping the closet door closed to conceal the smell and using a DIY activated carbon filter (have since upgraded to a 6" filter from amazon).
1. Don't use a weak exhaust. I went with a cheap 100 cfm and it couldn't maintain (-) pressure while hooked up to a carbon filter. I upgraded to a 6" 400 cfm (speed controlled to about 200 cfm). This exhaust is overkill for my 16 cubic ft. tent, but now I won't have to upgrade the fan for quite a while and I can tune it to the perfect amount of flow, and while I have the tent open for maintenance, I can run it full speed to mitigate some of the smell leakage during that time.
2. As soon as I upgraded the ventilation, RH dropped to a pretty consistent 55% (not the best, but without a good dehumidifier, this is pretty close to my indoor RH). If your RH is much higher than your local room conditions, you need better air exchange. Aim for RH of your tent to equal RH of your room.
3. The improved airflow and minimized RH allows me to maximize the carbon filter's potential without sacrificing exhaust output and I can now leave my closet door cracked (just enough to route the duct through). I use my old 100 cfm exhaust to bring air in from just outside of the closet. Even with lights off, my RH has been steady. These upgrades have sort of snowballed the efficiency of my grow, and well worth the $100-150.
1. Don't use a weak exhaust. I went with a cheap 100 cfm and it couldn't maintain (-) pressure while hooked up to a carbon filter. I upgraded to a 6" 400 cfm (speed controlled to about 200 cfm). This exhaust is overkill for my 16 cubic ft. tent, but now I won't have to upgrade the fan for quite a while and I can tune it to the perfect amount of flow, and while I have the tent open for maintenance, I can run it full speed to mitigate some of the smell leakage during that time.
2. As soon as I upgraded the ventilation, RH dropped to a pretty consistent 55% (not the best, but without a good dehumidifier, this is pretty close to my indoor RH). If your RH is much higher than your local room conditions, you need better air exchange. Aim for RH of your tent to equal RH of your room.
3. The improved airflow and minimized RH allows me to maximize the carbon filter's potential without sacrificing exhaust output and I can now leave my closet door cracked (just enough to route the duct through). I use my old 100 cfm exhaust to bring air in from just outside of the closet. Even with lights off, my RH has been steady. These upgrades have sort of snowballed the efficiency of my grow, and well worth the $100-150.
