High temperature growing

If your going to be running exhausts it doesn't make sense to suppliment with Co2 . Your just going to suck it right out, and it will never reach a ppm to make a difference. No amount of silica will make 90*f+ growing feasible. Silica helps, but it's not that good.
 
You can try it, but honestly I would get rid of the tent and put up pasteboard and paint it with flat white paint that contains titanium dioxide.
 
In my opinion for the few bucks it costs its worth a shot. Without co2 and at 90+ your ladies will spend considerable time stressing. With or without co2 they'll likely grow to completion but if you don't get those temps in check it will be anybody's guess.
 
Hookah makes a good point. If you're exhausting and using co2 you should pull your air from the top and bring in your fresh air from a spot towards the top..maybe opposite corner of the exhaust.
 
orbo said:
What are the temps outside your tent or where your passive intake feeds from?
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Temps from the passive duct (located on windowsill next to a window) are around 60-70 in day and 50-60 at night. I can close/open this window to change the temperature of where it is intaking from (about 2m of duct from window down to bottom corner of the tent)
 
orbo said:
In that case Hookah nailed it and an exhaust upgrade is in order.
Click to expand...
That sucks as ive just bought this 1 and put it inside an insulated box to keep the noise down lol. My carbon filter can only handle 117cfm (200m3/h) so would it be better to get a fan that exhausts 185m3/h and have it on full blast 24/7 or a fan that exhausts more air and turn it down?

Noise is a huge factor as i am sleeping right next to the tent, thats why i bought this tiny quiet fan and put it inside an insulted box (its very quiet)

Fan i just bought: http://www.ebay.co.uk/itm/like/Hydr...00068&clkid=263224433171905421&_qi=RTM2063723
 
orbo said:
That's a little fella there.
I use one of these in a 4x4x8 and it works pretty good.
http://www.htgsupply.com/Product-GrowBright- 4in-High-Velocity-Inline-Fan

As far as 24/7 - you mentioned 50-60 night time temps. That's pretty cold. You're running the LED 24/7 right now still?
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Nope theres nothing in there atm. Im just doing alot of testing right now to make sure i can sustain plants and its not a huge fail and waste of time and money. Im going to be doing autoflower to start so lights will be 18/6 from start to finish (lights on from 6am-12pm, 12pm-6am off) i was planning to close to window at night time which will raise the intake to about 68-72 which will keep the plants nice during the night, but my problem would be when the LED flicks on at 6am its guna be at like 90F+ within a couple of hours until when i wake up and get that window open which will bring it down a couple of degrees really not ideal :(
 
I'm sure there is a formula for that but I don't know it. Also you can probably overdrive that carbon filter a bit for the sake of the ladies. You can regulate the speed of fans fairly cheap and easy if need be.
 
Heat tolerance is Strain dependent, with sativa generally being the more forgiving of the two(three). Flowering at anything over 85F is going to hurt yield and most likely vigor. Heat will also cause Foxtailing or the stretching of buds so they are long and skinny not stout and fat.
 
Vettichi said:
Heat tolerance is Strain dependent, with sativa generally being the more forgiving of the two(three). Flowering at anything over 85F is going to hurt yield and most likely vigor. Heat will also cause Foxtailing or the stretching of buds so they are long and skinny not stout and fat.
Click to expand...
Thanks for the input just reassuring me that i need to get a better exhaust fan i guess. Any idea if an intake fan on the duct would reduce the temps by much?
 
Vettichi said:
Heat tolerance is Strain dependent, with sativa generally being the more forgiving of the two(three). Flowering at anything over 85F is going to hurt yield and most likely vigor. Heat will also cause Foxtailing or the stretching of buds so they are long and skinny not stout and fat.
Click to expand...
Flowering above 85f will not hurt the yield. There's a thread on here talking about flowering in higher temps and the correlation with greater thc production. I think it's in the advanced section.
 
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