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how do I vent grow tent?

Discussion in 'Grow Room Design & Setup' started by anhedonia, Apr 29, 2008.


    anhedonia Well-Known Member

    Im using a 4 x 4 x 7 ft high grow tent with a 1000 watt hps. I put 8 plants in there and the humidity shot up to 75%. Ive read that anything over 60% can cause mold when flowering. And since this is my new flowering closet I need it to be up to par. Does anyone know what to do for ventilation? I have a 4 inch port at the bottom and a 6 inch directly across from the 6 inch hole im using to blow out heat from the bulb. And my temps are below 87 f.

    gtugg Active Member

    Heat rises, so you want to suck air out of the top of the hut if you can. smell could be an issue so i would use a carbon scrubber. Works great for me! I have 2 4x4's and 1 4x8

    anhedonia Well-Known Member

    shit, my top port hole is pulling air conditioned air over the 1000 watt. im not sure what to do to remedy the problem in a hurry besides buy a blower or a dehumidifier. but im working under limited space. im open to any ideas.

    southfloridasean Well-Known Member

    You have to get a 6 inch exhaust fan for that hole at the top of the cab or your temps are going to be ridiculous using the 1000 watt hps. You may have to try to get the ac air to blow from the bottom of the tent or some type of oscillating fan below.

    anhedonia Well-Known Member

    I have a huge 630 cfm blower sucking heat off of the 1000 watt and my temps usually stay around 80 degrees f when ac is on. And i live in a pretty hot part of california so we'll be turning that on all the time soon.

    UserFriendly New Member

    This is the thing to do.

    If you were open to any ideas, you would not have dismissed this. If you don't have any other ports, you will need to get a duct wye fitting.

    anhedonia Well-Known Member

    shit! This would mean doing some recontruction in there big time. Moving the fan reaconnecting exhaust hozing etc. Damn it, its like I cant get A break from this shit. its like full time work. Plus dumping money into what seems like a bottomless pit.

    southfloridasean Well-Known Member

    Youll be alright man. Just do it right the 1st time so you wont have to inject any more money from things going wrong. Just keep a positive attitude. Na mean. :peace:

    anhedonia Well-Known Member

    my mom put a fan blowing into one of the bottom vent flaps last night and it kept the humidity down to about 45%. And I have airflow coming out of one of the 6inch ports that I didnt use.
    Thing is, last night when I checked them after the light went off all the plants were droopy like I over watered them. And when I checked them this morning a few hours after the light was on they seemed to be doing fine. Anyone know what that is? Maby humidity problem but the humidity was down. Theyre all in three gallon pots and i water them 1 gallon every 2 days.

    Enigma Well-Known Member

    The tent should be vented once every 2-3 minutes..


    4 x 4 x 7 = 112 cu. ft.

    Pick a fan that will run approximately 200cfm because a filter will greatly reduce the amount of airflow out of the tent.



    gtugg Active Member

    Do you have an Oscillating fan inside at all? I would blow air through your hood and out of the hut. And sucks air out of the top.

    Streetsk8 Well-Known Member

    i think ur plant where sleeping men ;)

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