The Grow Awards 2025 🏆

Chat

By continuing to use the website or clicking Accept you consent to our cookies and personal data policy and confirm that you are at least 18 year old. For details please see Privacy Policy and Terms

Accept

Recommended

Back to Grow Questions

RH 90% during Flowering!

versace_growstarted grow question 5 years ago

I have a problem with RH. I am at the 3rd week of Flowering and I'm struggling to keep my RH down. Today it was 90% when I opened the grow box. I have access only to a window. Is it better to suck air inside or blow the exhausted air out? I can't do both

Solved

Setup. Sensors

Setup. Ventilation

likes

OutForRealanswered grow question 5 years ago

The humidity is inside of the box so the best choice it’s to blow the air out off of the box. I have the same issue with auto and I am growing box half open , it is working a bit but be sure that you’ll have bud rot issue with 90% so check your buds frequently and let a fan blow directly on the plant ( not recommended in general ) to blow the humidity out off of the buds

1 like

Complain

Selected By The Grower

versace_growanswered grow question 5 years ago

EDIT: I meant I have an extractor inside the tent: I can put the duct in which the air get in the tent at the window and the exhaust tube just blowing in the room or I can suck air in the room and put the tube that extract the air from the tent out of the window

likes

Complain

Jef79answered grow question 5 years ago

Hello.. Hope you are well.. Tricky question.. Personally i wud have a fan extracting air from ur tent into room with window open.. U can purchase cheap humidity reducing items from most pound shops that will last at least a couple of wks b4 u need replacing.. This shud reduce humidity a great deal.. Hope all goes well and stay safe.. 👍

1 like

Complain

Similar Grow Questions

Solved

How crucial is an exhaust fan and a carbon filter?I cant find anything in my country as a kit, but would buying them piece by piece work? Example something like in the photo connected to an air duct and then to a carbon filter? Or if the exhaust fan is not crucial? how can i get rid of the smell in a cheaper way?

Setup. Ventilation

a year ago

1

2

Solved

serious question about VPD value in the tent I'm not sure which values I should consider more important, or both. I have one sensor about 10cm above the Canopy and one sensor directly below it. I am trying to keep the VPD optimal in this grow, but which one is the "right" one?

Setup. Sensors

a year ago

3

Solved

Luftfeuchtigkeit zu hoch für die Blüte? - Methoden zur Luftfeuchtigkeitsregulierung Ich merke das ich die Luftfeuchtigkeit nicht dauerhaft unter 50% bekommen werde, denkt ihr ich sollte in einen Luftentfeuchter investieren? (Sensor auf Pflanzenhöhe) Ich will nicht riskieren das sich Schimmel and den Blüten bildet. Danke schon mal für die Antworten 💪👽

Other. General questions

Setup. Sensors

Setup. Other

a year ago

7

1

Solved

White dots on the pistils Hi everyone, what are these white dots on the pistils, they come out with every cultivation, can anyone help me?

Buds. Not fattening

Setup. Ventilation

Techniques. SoG

a year ago

2

2

Solved

Brauche ich unbedingt einen (Schwenk-) Lüfter in meiner Growbox?Habt ihr schon mal ohne (Schwenk-) Ventilator in der Growbox angebaut? Wenn ja, welche Erfahrung habt ihr dabei gemacht? Ich möchte nur ungern einen Ventilator einsetzen, weil das vermutlich die Lautstärke der Box deutlich erhöht. Schon mal vielen Dank für eure Erfahrungen.

Setup. Ventilation

7 months ago

9

8

Solved

Is 15min/hour enough ventilation?Is 15min ventilation every hour enough for my 80x80cm 4 plants enough? intake: BLAUBERG 10cm 102 m3/h exaust: BLAUBERG 10cm - 145-187m3/h

Setup. Ventilation

6 months ago

3

5

Solved

2x2 Circulating Fan What is the best circulating fan for a 2x2 tent available on the european market? I bought a Secret Jardin MO20 oscillating fan, and I highly regret it because I have read several reviews mentioning that it can catch fire. Is there any other good alternative for circulating air?

Setup. Ventilation

5 months ago

2

2

Solved

Maintaining VPD I've got my photoperiod doing well in a 2x2 tent. I'm trying to regulate my VPD with what I have on hand. Currently I'm running my exhaust fan for 8 minutes every hour to get an average VPD around 1, but I'm concerned about the swings. Am I micromanaging?

Setup. Ventilation

Setup. Other

3 months ago

1

Solved

Connecting 2 SANlight evo 3-100 with AC Infinity Controller 69 PRO Hi guys, I want to connect 2x SANlight 3-100 1.5 with AC Infinity Controller 69 PRO. I searched on the internet and found that i'll need this sanlight Trolmaster RJ12 cable and this AC Infinity UIS Type-A RJ11/12 0-10V Dimmer. Do I need this stuff for each lamp or can i combine?

Setup. Sensors

Setup. Lighting

2 months ago

2

3

Solved

placement of sensor for humidity/temperature Where should I place the sensor for humidity/temperature? I see huge differences depending on the spot, I have placed the sensor now slightly below the top leaves - above the lamp directly hits and it has 4 degrees (celsius) more!

Setup. Sensors

2 months ago

3

3

Solved

DuschkabinenGrow

Smell through filter exhaust The smell inside is quite strong and is coming through the filtered exhaust. Is this normal, or does it mean I need to replace my filter soon?

Setup. Ventilation

3 months ago

5

Solved

Are (constantly) high daytime temperatures a huge problem in flower?My day temperature since turing my light up to max during flower are reaching 29-30c | 84.2 - 86f, while the daytime RH is at roughly 40% - 50%. Is the high temperature something to be concerned about? pics 1 and 2 are the exact same data as pics 3 and 4, just set to c/f each.

Other. General questions

Plant. Other

Setup. Ventilation

12 days ago

1

Solved

Is this clawing, or just droop, (pots fairly dry)And why can’t I get RH below 70% with more than adequate ventilation, I’m recalibrating my hygrometer in the meantime.

Leaves. Curl down

Setup. Ventilation

20 days ago

1

Solved

Humidity ?When should I remove the top of the propagator ?

Setup. Ventilation

5 years ago

6

4

Solved

TripleCcannabis

Low humidity issue Tents 20'' × 30''. Using a vivosun 6'' inline fan to exhaust with passive intake to create negative pressure. I have a good humidifier but even on full the rh doesnt go above 40%. Not unless the room the tent vents into becomes super humid as well.

Setup. Ventilation

Setup. Other

5 years ago

1

4

Solved

Keeping up the moisture I’m having some trouble keeping my humidity up in the veg period as my fan is sucking all the moisture out of the room ?

Setup. Ventilation

5 years ago

1

2

Solved

Puffdamagikchillum

Hygrometer with probe What is everyone buying for a Hygrometer with probe?

Setup. Sensors

5 years ago

3

3

Solved

Puffdamagikchillum

Do you think a 4 Inch 203 CFM Inline Fan with carbon filter is ok for a 32x32x63 tent and whats best way to set it up to exaust?

Setup. Ventilation

5 years ago

2

2

Solved

What to do with vent flaps on tent?What to do with vent flaps at bottom of my 2 x 2 tent? Exhaust fan running at ~33% speed with carbon filter in tent as intake. Tent In cold room (overnight temps 45-55*F) , running heater and humidifier in tent. Currently, 2 of 3 flaps tented at bottom of flap to allow air in.

Setup. Ventilation

5 years ago

4

2

Solved

Puffdamagikchillum

Tips on where to exaust air flow from grow tent

Setup. Ventilation

5 years ago

5

6