Amnesialocal Posted April 2 Share Posted April 2 Hi all, there is something which is working to help me reduce RH in flower stage…and more now that I moved to coco. And this is ventilation/extraction. here a rudimental sketch of the space that I have allocated my tent. I am using mainly passive intake, with 1 lateral slot open, plus the 4” entrance ( tried several times active intake but without great results). With the HPS It wasn’t sufficient and I had to open the tent…Now I moved to LED and for photoperiod, location,security,etc I need to keep the tent closed all the time. Now as per sketch you see a door which is opening to an outside space. If I open the door, just slightly (1-2cm)…the RH drop down very fast easily 5-10% in 20-30min. It seems that the flow of air is more strong and the negative pressure is very effective… The problems are temperatures, which also can drop ( much slower than the RH). so when I close the door, Rh start to raise again and after other 30min back to where it was before. I have two passive openings ( one down and another up) but they don’t seem to do a lot. I created also a 6” opening for extraction, but I changed location and tried to use the opening to see if the results where as the door…and actually it wasn’t (too small probably?) How can I reproduce this same “suction” effect? Should I consider an intake that bring air inside the “other space” from time to time? I assume when temperatures will be more summary I can consider to create some opening to simulate such intake size ( which actually is very small…1.8m for 1-2cm …this is the same size of a slot of 35cmx10cm. But during cold season? With coco, and and I guess even more during flowering humidity is very high and daily. currently RH varying between 70-75% ( I have set extraction at 75 otherwise could grow up to 80%) Any idea? Note sure what I did with the image but it is almost at scale 1:1 Link to comment Share on other sites More sharing options...
BilgePump Posted April 3 Share Posted April 3 No mention of temperatures? Link to comment Share on other sites More sharing options...
Herbal Kint Posted April 3 Share Posted April 3 I have less RH issues in cold weather duno how its in UK tho. I keept hps a side by my led in cold months. For pasive maybe more holes? Google Dust shroom if few of those would do? 1 Link to comment Share on other sites More sharing options...
inceywinceyspider Posted April 3 Share Posted April 3 I think that the passive intake from outside to the 'other room' is insufficient and you should try attaching a fan to it. 1 Link to comment Share on other sites More sharing options...
Amnesialocal Posted April 3 Author Share Posted April 3 2 hours ago, BilgePump said: No mention of temperatures? Sorry...i have set extraction starting at 26...26-27C. I replaced a 4" with a 6" which. At 1 in 1min bring me temp down from 27 to 26. If I open the door in 20-30 ...26C become 23-24c and go down. Link to comment Share on other sites More sharing options...
Amnesialocal Posted April 3 Author Share Posted April 3 1 hour ago, inceywinceyspider said: I think that the passive intake from outside to the 'other room' is insufficient and you should try attaching a fan to it. Thanks! Do you mean a fan bringing air from outside inside correct? I could test this easily using the 6" hole I created. Will try and back:) Link to comment Share on other sites More sharing options...
inceywinceyspider Posted April 3 Share Posted April 3 Aye looking at your diagram from 'outdoor' into 'other space' Link to comment Share on other sites More sharing options...
BilgePump Posted April 3 Share Posted April 3 Warmer air has greater capacity for holding moisture, try having your extraction set to 30°c and see what happens Link to comment Share on other sites More sharing options...
KC Posted April 3 Share Posted April 3 Aye you turning your extraction on and off? 1 Link to comment Share on other sites More sharing options...
BilgePump Posted April 3 Share Posted April 3 @KC might have nailed it. Aim for stability with yer extract running 24/7 then try to tackle the rh issue. 1 Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now