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Thread: heat problem ( 400w hps )

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    Default heat problem ( 400w hps )

    hello. i am trying to have my first grow and i have an issue with the temperature. it gets up to 37 - 40*C in a 50x100x150 tent. i am using a 400w HPS Sunmaster dual-spectrum + cool tube 5" and an advanced star eco duct 5" 210m3/h fan sucking the air trough the cool tube. i also have two fans in the tent for the ventilation and i made a hole for passive intake at the oposite corner of the extraction fan. i added a picture made in paint of my tent. it is actually a greenhouse and i added mylar inside and some duct tape all over outside but i consider buying a real grow tent about 0.8x0.8x160 and i will also need a carbon filter (limited budget). i apreciate any help. thank you

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    Last edited by darksheep; 08-08-16 at 06:11 PM.

  2. #2

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    I assume you mean pushing the air through your tube by your diagram. If not, you are not exhausting any hot air and have created a postive pressure in your tent. First try moving more air, both in and out. If that does not work then you have to start cooling air with a/c. Or go down in wattage of light.

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    Ideally you want a separate fan for you cooltube. One for carbon filter and one for cooltube. The cooltube pushing all the way through the tent. The carbon filter exhausting at the top of your tent, a seperate fan sucking through your filter and out the top. Your intake at the bottom.

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    Quote Originally Posted by Joe Dirt View Post
    Ideally you want a separate fan for you cooltube. One for carbon filter and one for cooltube. The cooltube pushing all the way through the tent. The carbon filter exhausting at the top of your tent, a seperate fan sucking through your filter and out the top. Your intake at the bottom.
    the fan is pushing the air trough the cool tube. ( when i keep my hand above the duct out the tent is warm air coming out from the tent). also when i put my hand at the intake hole i feel it windy so i think the negative presure works and ventilation might be not perfect but there is a sensitive breeze at least. i was thinking maby the space is to small ? i am thinking to buy a grow tent as i have an improvisation now. ( greenhouse + mylar ). what do you sugest, 06x06x160 or 08x08x160 for 2-3 plants ?

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