Best way to get rid of heat (hps/mh)
- Thread starter Braman
- Start date
SouthCross
Well-Known Member
#1.
TacoMac
Well-Known Member
You need to get a duct fan for the size ducting you're using. Most use 6 inch as it fits the 6 inch cool tube.
Something like this: http://www.homedepot.com/p/Suncourt-Inductor-6-in-Corded-In-Line-Duct-Fan-DB206C/206584745
Some people use larger fans at the end of the duct (push or pull) as in the illustration I posted above. That's a very large fan that moves TONS of air. Probably overkill in reality.
Something like this: http://www.homedepot.com/p/Suncourt-Inductor-6-in-Corded-In-Line-Duct-Fan-DB206C/206584745
Some people use larger fans at the end of the duct (push or pull) as in the illustration I posted above. That's a very large fan that moves TONS of air. Probably overkill in reality.
OldMedUser
Well-Known Member
If all you are doing is one cool tube with it's own air supply then those duct fans are plenty big enough to keep it cool. Those plastic blades should be able to take the heat.
I use option #3 in my grow room. Got a 1000W HPS going in there now and temps are 75 max.
I use option #3 in my grow room. Got a 1000W HPS going in there now and temps are 75 max.
If plastic blades are problem, you can use "blow through" fan also.. I used bathroom fan for 400w and cooltube got really hot.
Maybe 2nd and 3rd option is good as well and cold air intake can be given from outside with another fan? So, one fan sucks air from all box, near bulb and another fan blows cold air from outside box to inside.. And both of them can be controled by 2 termoregulators: first one switches on when temp gets hot (sucks air out near hot bulb, for example it gets 23C in room) and seconds switches on when temperature gets up to 25C.
Maybe 2nd and 3rd option is good as well and cold air intake can be given from outside with another fan? So, one fan sucks air from all box, near bulb and another fan blows cold air from outside box to inside.. And both of them can be controled by 2 termoregulators: first one switches on when temp gets hot (sucks air out near hot bulb, for example it gets 23C in room) and seconds switches on when temperature gets up to 25C.
OR..
If I have 2 lines for air and there is no possibility to make another one.. One line can be used for cold air intake and second one for hot air output and it could be equiped with "coal"filter or how are they called, right? So second one sucks hot air and also filters the smell..
I am wondering if there is enough CO, do plants need extra fresh air?
Sorry for double post!
If I have 2 lines for air and there is no possibility to make another one.. One line can be used for cold air intake and second one for hot air output and it could be equiped with "coal"filter or how are they called, right? So second one sucks hot air and also filters the smell..
I am wondering if there is enough CO, do plants need extra fresh air?
Sorry for double post!
OldMedUser
Well-Known Member
I just have passive intakes for fresh air that comes from the rest of the basement the grow room is in. It all goes through anti-static wiping cloths as filters to help keep bugs and spores out. You really want a negative air pressure in your grow room so any air that leaves has to go through the carbon filter if so equipped. If you push air into the room faster than it's extracted then you'll have positive pressure in there and stink leaking out of any place it can.
I'm using ozone that is connected to my fan controller so when it kicks in the O3 gets shot into the far end of a 25' 6" hose so the O3 has time to react with the odor molecules before it gets outside. The old carbon filter I was using doesn't work any more and was so restrictive that even with the fan at full blast I could barely keep the heat in the low 80s.
Unless you are supplying CO2 then you need to replace the air to get more CO2. As the CO2 levels drop plant growth slows and will come to a complete stop once all the gas is gone. My basement is very cool and barely above freezing in the coldest months of winter here so I need to have enough light going to trigger my fan controller once in a while to get fresh air into the grow room. With only one 400W light going the heater will kick in to keep it warm enough and even then the fan won't kick in unless the humidity gets high enough. Bit of a balancing act to make it work.
When I only have one 400 going it means I don't have that many plants going either so there is less need for more CO2 so often. I have 27 plants under that 1000W now and it's hot enough to have the fan going half speed half a dozen times an hour for about 5 min each time so lots of fresh air.I think I could have used some CO2 for this grow but ran the tank dry on the last grow and didn't have $65 to spare to get it filled.
I'm using ozone that is connected to my fan controller so when it kicks in the O3 gets shot into the far end of a 25' 6" hose so the O3 has time to react with the odor molecules before it gets outside. The old carbon filter I was using doesn't work any more and was so restrictive that even with the fan at full blast I could barely keep the heat in the low 80s.
Unless you are supplying CO2 then you need to replace the air to get more CO2. As the CO2 levels drop plant growth slows and will come to a complete stop once all the gas is gone. My basement is very cool and barely above freezing in the coldest months of winter here so I need to have enough light going to trigger my fan controller once in a while to get fresh air into the grow room. With only one 400W light going the heater will kick in to keep it warm enough and even then the fan won't kick in unless the humidity gets high enough. Bit of a balancing act to make it work.
When I only have one 400 going it means I don't have that many plants going either so there is less need for more CO2 so often. I have 27 plants under that 1000W now and it's hot enough to have the fan going half speed half a dozen times an hour for about 5 min each time so lots of fresh air.I think I could have used some CO2 for this grow but ran the tank dry on the last grow and didn't have $65 to spare to get it filled.
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