Flowering Humidity RH%

The increase in rh during flowering is due to the massive increase in perspiration during flower, all veg growth stops and everything is devoted tooooo flowers, Humidity will always rise to the top of a grow tent, along with heat. Tent air outtake should be as high as possible, while Intake should be low. Humidity at top of tent will be around 20rh higher than the bottom or thereabouts. Make sure to take readings from various parts of tent and not making decisions based on one reading from one area. It's vital that there is good air circulation in entire tent. I chained a portable dehumidifier to top of my grow tent, buy a extra bar to reinforce the tent if it's heavyyyyy. Most portable dehumidifiers come with a universal extension for drains. Just run rubber hose to a 5 gallon jug and empty every couple days. It's actually a very good way to measure when to water next. Also good to make sure your fan has adequate CFM cubic feet per minute for the space you plan to clear in the time you want it cleared. If you add carbon filter or have any distance over 12 ft use substantially more cfm than is required. 4x4x6=96ft 100 cfm +carbon filter 200 cfm + distance to extract over 15ft 300cfm or additional fan. Idea is to create negative pressure (sucks in) within the tent so you extract the entire tent within a minute. Set timer to 1 on 10 off or whatever works for you.