Heat problems 2000watt grow

[roorsmoker]

I haven't posted anything in a few months. Been busy moving/working.

Problem: Temperature is topping out in the upper 85+ degree area, despite plenty of airflow and an AC unit. I'm NOT flowering, nor am I using HPS until I correct this ventilation issue.

-I have a 4'X8'X6.6' tent with a 6 inch 545 cfm Vortex exhaust running full speed, pulling through two Apollo enclosed hoods with a 6 inch iPower carbon filter in front of the hoods. The bulbs are exactly 4 feet above the floor of the tent. Too low possibly?

-The tent is mostly empty of plants (9 seedlings taking up about 2 square feet). I had my 2 foot HO t5 envirogro on with the thermometer underneath the lights, with the t5 still on. Maybe the t5 light fixture absorbed too much heat and I got a bad reading? Thermometer is a Caliber IV digital. Maybe the black absorbs too much heat and gives a bad reading?

-The two hoods are each holding 1000W Eye Hortilux SuperHPS bulbs.

-I have an active intake blowing in the bottom opposite side of my exhaust. It is an 8 inch 745 cfm Hurricane sucking through an 8 inch Dustshroom (HEPA alternative) and blowing into the tent. I have an IDEAL air controller plugged into the 8 inch hurrcane. It's turned down to about 40%, as to not create positive pressure inside the tent.

- There is a 12000 BTU portable AC cooling the room the tent is in. The AC exhaust is blowing outside the house, along with the tent exhaust.

I know the obvious question is, "why don't you use the 8 inch for exhaust and the 6 inch for intake?" I could, but I would need adapters for my 6 inch flange (or a new flange), and adapters for my 6 inch hoods. And also a 8" to 6" reducer for my Dustshroom.
-Do you recommend I raise my lights/remove exhaust ducting? Buy better hoods (they seem pretty air tight, they have screws and a rubber seal)? Add a cheap 6" can-fan in between my two hoods? Any other ideas, like toughing it out and buying adapters, making the 8 inch fan my exhaust, and my 6 inch fan an intake?

Passive intake was actually worse despite tons of negative pressure. Maybe not enough passive intake?

Posting many pictures, sorry for the detailed question.

Anyone with any experience in HVAC at all, chime in please. It's also going to get very, very cold where I am in the winter. Its already in the 50s at night.

Without the HPS on, the temperature under the T5s drops about 6 degrees as opposed to no ventilation on at all.

 

[Indagrow]

Or two 6 to 8 adapters...one after the hoods still run the six inch hose, to the 8 inch exhaust. Then run the six as your intake with the other adaptor to your scrubber. I don't think that six is pulling enough air over both hoods and through your filter... try the swap, adapters are cheap at lowes or homedepot and the places are awesome I'm sure you need more shit I always come back with extra

 

[roorsmoker]

I'm trusting your two cents. I wanted an easy work-around.... I'm not going to chance it. I think I'll heed that advice lol.

 

[Indagrow]

Ha, well you can always switch back and return the adapters but this way you don't need to limit your six to keep that negative pressure, the eight will pull just fine. With that cold coming it will be easier to dial it back once heat is no longer the issue rather the cold

 

[fandango]

What is the supply temp coming out of the 1 ton a/c unit?

 

[roorsmoker]

I had the AC around 72 or so. Didn't have it on max fan setting, only on low.

Do you off the top of your head, or does anyone have any idea if an 8 inch to 6 inch reducer will attach directly to an 8 inch hurricane fan?

Or could you give me a brand that does? Lowes or Home Depot attach to ducting fine, but I've never tried to attach the reducers directly to an inline fan. is it possible?

or just use a tiny amount of ducting to attach the reducer?(seems inefficient?)

Thanks so much for the input.

 

[weedenhanced]

I had the AC around 72 or so. Didn't have it on max fan setting, only on low.

Do you off the top of your head, or does anyone have any idea if an 8 inch to 6 inch reducer will attach directly to an 8 inch hurricane fan?

Or could you give me a brand that does? Lowes or Home Depot attach to ducting fine, but I've never tried to attach the reducers directly to an inline fan. is it possible?

or just use a tiny amount of ducting to attach the reducer?(seems inefficient?)

Thanks so much for the input.

It's not that hot

 

[oill]

I haven't posted anything in a few months. Been busy moving/working.

Problem: Temperature is topping out in the upper 85+ degree area, despite plenty of airflow and an AC unit. I'm NOT flowering, nor am I using HPS until I correct this ventilation issue.

-I have a 4'X8'X6.6' tent with a 6 inch 545 cfm Vortex exhaust running full speed, pulling through two Apollo enclosed hoods with a 6 inch iPower carbon filter in front of the hoods. The bulbs are exactly 4 feet above the floor of the tent. Too low possibly?

-The tent is mostly empty of plants (9 seedlings taking up about 2 square feet). I had my 2 foot HO t5 envirogro on with the thermometer underneath the lights, with the t5 still on. Maybe the t5 light fixture absorbed too much heat and I got a bad reading? Thermometer is a Caliber IV digital. Maybe the black absorbs too much heat and gives a bad reading?

-The two hoods are each holding 1000W Eye Hortilux SuperHPS bulbs.

-I have an active intake blowing in the bottom opposite side of my exhaust. It is an 8 inch 745 cfm Hurricane sucking through an 8 inch Dustshroom (HEPA alternative) and blowing into the tent. I have an IDEAL air controller plugged into the 8 inch hurrcane. It's turned down to about 40%, as to not create positive pressure inside the tent.

- There is a 12000 BTU portable AC cooling the room the tent is in. The AC exhaust is blowing outside the house, along with the tent exhaust.

I know the obvious question is, "why don't you use the 8 inch for exhaust and the 6 inch for intake?" I could, but I would need adapters for my 6 inch flange (or a new flange), and adapters for my 6 inch hoods. And also a 8" to 6" reducer for my Dustshroom.
-Do you recommend I raise my lights/remove exhaust ducting? Buy better hoods (they seem pretty air tight, they have screws and a rubber seal)? Add a cheap 6" can-fan in between my two hoods? Any other ideas, like toughing it out and buying adapters, making the 8 inch fan my exhaust, and my 6 inch fan an intake?

Passive intake was actually worse despite tons of negative pressure. Maybe not enough passive intake?

Posting many pictures, sorry for the detailed question.

Anyone with any experience in HVAC at all, chime in please. It's also going to get very, very cold where I am in the winter. Its already in the 50s at night.

Without the HPS on, the temperature under the T5s drops about 6 degrees as opposed to no ventilation on at all.

You using insulated ducting???

 

[Indagrow]

I had the AC around 72 or so. Didn't have it on max fan setting, only on low.

Do you off the top of your head, or does anyone have any idea if an 8 inch to 6 inch reducer will attach directly to an 8 inch hurricane fan?

Or could you give me a brand that does? Lowes or Home Depot attach to ducting fine, but I've never tried to attach the reducers directly to an inline fan. is it possible?

or just use a tiny amount of ducting to attach the reducer?(seems inefficient?)

Thanks so much for the input.

They go directly on man, worst comes to worse it's a little tight you can make a cut into them, then hose clamp till secure and use duct tape to seal it. It's just the diameter there isn't any games as far as comparability in hvac if it's the right diameter it fits...

 

[Queece]

Dude I'd route the cold outtake to your ac into the tent, keep your exhaust fan on max and only run it every fifteen minutes for five minutes. Those vortex fans can clear that tent in no time flat, which is why I think you're actually exhausting too quickly. Replace the positive pressure intake with a feed from the ac running on constant low, it should handle the heat just fine if it's rated at one ton. Your bulbs should stay pretty hot, I'd definitely raise them, mind you, but they're more efficient that way. You could even go with a cheap adjustawing setup or any passively exhausting hood, might be better with vertical constraints and would trap less heat in the hood enclosure which then radiates faster than the heat of the bare bulb.

 

[Alaric]

Do you off the top of your head, or does anyone have any idea if an 8 inch to 6 inch reducer will attach directly to an 8 inch hurricane fan?

This is how I did attached an 8" to 6" reducer to the 8" blower.

Took 3 self drilling screws and attached the adapter to the lip of the blower.

Then sealed around it with aluminum duct tape.

A~~~

 

[roorsmoker]

You using insulated ducting???

No just Home Depot crap ducting for now, but good idea.

Next go around sounds like a must have. I figured since it was so cold here in the winter I wouldn't need it. That's stupid though because all it would do would help me save some money on power, especially with a thermostat or timer on my exhaust.

I'm going to want to add a thermostat to my set up in the winter. Anyone know any good links to setting one up oneself? Thanks so much everyone. Amazing feedback!

 

[roorsmoker]

View attachment 3500484
This is how I did attached an 8" to 6" reducer to the 8" blower.

Took 3 self drilling screws and attached the adapter to the lip of the blower.

Then sealed around it with aluminum duct tape.

A~~~

My fan sits pretty nicely against the reducer. Do you think i NEED the self-drilling screws? Or do you think plenty of aluminum tape could hold? it's only supporting about 2 foot of ducting at the most. But for air pressure, I'm thinking the aluminum tape by itself should be ok? What do you think? My reducer is slightly different its more cone shaped from Home Depot.

 

[oill]

No just Home Depot crap ducting for now, but good idea.

Next go around sounds like a must have. I figured since it was so cold here in the winter I wouldn't need it. That's stupid though because all it would do would help me save some money on power, especially with a thermostat or timer on my exhaust.

I'm going to want to add a thermostat to my set up in the winter. Anyone know any good links to setting one up oneself? Thanks so much everyone. Amazing feedback!

I have a primaklima duct fan with built in thermo... It's the mutts Nutts.

You can get a plug thermostat that you plug the fan into to turn it on and off. Cheap and easy.

Also remember humidity control is key. Air flow isn't just about heat

 

[Indagrow]

My fan sits pretty nicely against the reducer. Do you think i NEED the self-drilling screws? Or do you think plenty of aluminum tape could hold? it's only supporting about 2 foot of ducting at the most. But for air pressure, I'm thinking the aluminum tape by itself should be ok? What do you think? My reducer is slightly different its more cone shaped from Home Depot.

6inch/8 inch hose clamps would be ideal... Any improvement with the setup yet?

 

[Gquebed]

At 85 youre close to where you want to be.

I have a same size space. I use a window ac, which works far better than the portables. I also cool my lights independantly: ducting from outside the space to the lights off the lights then out of the space to the fan and out a window. That keeps the ac from running constantly....

 

[roorsmoker]

At 85 youre close to where you want to be.

I have a same size space. I use a window ac, which works far better than the portables. I also cool my lights independantly: ducting from outside the space to the lights off the lights then out of the space to the fan and out a window. That keeps the ac from running constantly....

My room the tent is in is a bit too small for that. So until next year, when I buy the window AC instead, I won't be able to do that. Plus I would have to buy a separate fan for the carbon filter. It's getting cooler every night. My LIGHTPROOF 8 inch ducting finally came in yesterday. I'm going to town today on it. Will update later tonight/tomorrow.... HOPEFULLY!

You are correct about that being the most efficient HVAC set-up though.

Do you exhaust your grow out of the house or out of the tent? I know you said the lights go out the house.

 

[roorsmoker]

I have a primaklima duct fan with built in thermo... It's the mutts Nutts.

You can get a plug thermostat that you plug the fan into to turn it on and off. Cheap and easy.

Also remember humidity control is key. Air flow isn't just about heat

Do you think a Hurricane 745 CFM will be compatible with a thermostat?

You are so right about the humidity. Good point. It gets really dry here and I think too much airflow would drop the humidity too low and close the stomata. This is my first grow anywhere other than a humid, temperate climate. Dehumidifiers and AC's work wonders for those.

 

[Gquebed]

My room the tent is in is a bit too small for that. So until next year, when I buy the window AC instead, I won't be able to do that. Plus I would have to buy a separate fan for the carbon filter. It's getting cooler every night. My LIGHTPROOF 8 inch ducting finally came in yesterday. I'm going to town today on it. Will update later tonight/tomorrow.... HOPEFULLY!

You are correct about that being the most efficient HVAC set-up though.

Do you exhaust your grow out of the house or out of the tent? I know you said the lights go out the house.

Out of the house through a window. The basement would heat up to much anyway...

 

[roorsmoker]

Ok, here's a few pics of the girls since hooking up the 8 inch exhaust. I have it turned it a little less than 1/3 down, but still waiting on my 6 inch dust shroom for active intake. The 8 inch dust shroom wouldn't fit over 8 inch ducting nor an 8 inch flange so I sent it back for a 6.

I added a two foot 8-site T5 HO. I won't be able to test the temperature for the HID part of the setup until my 6 inch dustshroom comes in.

However, passive intake with active exhaust is plenty for T5s and veg.

Question guys?:The first picture, the plant on the back right is wilting with purple petioles no matter how much/little water it gets. It was wilting before transplant. I am going to hit it with Hydroguard tomorrow along with a light flush, because I'm thinking it's salt buildup (hopefully not root rot, but Hydroguard JIC!). I've been feeding at a pretty constant 500 ppm with 140 ppm in between. I wouldn't think this would be too high, except it's been REALLY dry in my tent. like 25-30% rh . So they are probably drinking more than they should. I pH'd the coco at 6.0 and the water has been 6.0-6.2. This is a high pH from my experience in coco, but a lot of people have told me recently to pH coco to 6.0-6.5 for veg and 5.5-6.0 for flower.

Maybe I should drop my pH back down?

Some of the younger/smaller ones are starting to lighten up a bit in color and have some wilty, purple stems also.

Does anyone know what this is? I guess I need to test runoff PPM and pH before anyone can give me a definite answer. Could it be genetics?

Temperatures are around 78-80 during lights on with plenty of airflow and 68-75 during lights off. Lights are about 1-3 inches away from plants.

The last 3 pictures is a plant that somehow kept its first set of leaves. The embryonic dicotyledon is still attached and green after about 4 weeks!