tempture question
- Thread starter 1000w/dwc
- Start date
Cannabisculture
Active Member
not horrible but definitely work on lowering those temps
your humidity is fine, could raise it a some if you wanted
shoot for max 80 F min 60 F
your humidity is fine, could raise it a some if you wanted
shoot for max 80 F min 60 F
1000w/dwc
Member
Yea im thinking about getting and little window ac. or maybe a bigger exhaust fan its only 180 cfms. and my intake is 400cfm.
1000w/dwc
Member
if in flowering that humidity is fine, but if you are talking seedlings you want about 70%...and have it lower over the vegetative cycle
and my little plants are on there second leaf cycle. and on big ones are on there 3rd leaf cycle
1000w/dwc
Member
I did have it that way. the 400 cfm one was hooked up to the carbon filter and then going threw the light hood and the 188 cfm pulling in air. so i should put it back the way i had it? it stayed the same temp after i switched them
1000w/dwc
Member
haha yea i didnt know i could quote it at first
knourgro
Active Member
ya definatly put your intakle fan as your exhaust fan, but i personally wouldnt put your less powerful fan on the intake, this will creat a vacuum (negative pressure) within your box. A) this is not good for plants as it keeps oxygen levels lower and cuts down on your freshh air exchange. B) a vacuum inside will create "cyclones" or still spots in the box where hot air will never be dragged from, which will still keep your temps high.
m y vote goes to putting the more powerful fan to exhaust, and just leave the smaller one off, all its doing is diminnishing possible arir flow
knourgro
Active Member
I did have it that way. the 400 cfm one was hooked up to the carbon filter and then going threw the light hood and the 188 cfm pulling in air. so i should put it back the way i had it? it stayed the same temp after i switched them
its easier to pull air than to push it, so to achieve the full 400 cfm you need to have the fan at the last possible duct spot before exciting the grow room. so your air flow should go into box through passive intake, then be sucked in through the carbon filter at the top of your box, then go through your cooled light, then go through your fan, then go out of your box. so you always want the fan pulling air for as much time as it can. if you had it set up to go through thre fan, then light, then carnbon filter, youd loose alot of your rated CFMS
1000w/dwc
Member
yea right now i have my carbon filter then fan then light... so put the fan after the light?
batf1nk
Well-Known Member
Robster has it right. Basically your bringing in more air than your fan can expel, all the time the intake air is waiting to be exhausted, its heating up and becoming an issue. Negative pressure is the key, higher rated exhaust than intake will help your issue immensely.
projectmayham
Active Member
Yeah i would bring that temp down. But in the mean time, just keep your ppm's down with your feed. The higher the heat, the more thirsty your plants will be, and they will require more water than nutes. So if your normally at like 600ppms at 78 F. be at like 250ppms when your temp is at 88. My mate told me this awhile ago and its always helped me out in the summer time when i get really high heat in my room.
