95 degrees too hot? Why isn't my ventilation working better?

[berkman858]

I'm guessing you chose this fan because it's quiet. Most 8" inline fans put out 50% more cfm. Prob be better off with a bigger fan and insulate it to quiet it down.



So true! i think we get hyperfocused on providing optimum conditions at any cost. If you just use what you have, play the cards your dealt and do the best you can. You will have something nice to put in your bag at the end. It might not be as dense or as much but the rewards are still there for those willing to make it happen for themselves.

Bah, I want dense and never ending nuggets so you can have your half O if you want but I want my elbows...

 

[budleydoright]

Bah, I want dense and never ending nuggets so you can have your half O if you want but I want my elbows...

Me Too! It's just us some of us pot snobs put out this vibe that if you don't have a perfect room you can't do it at all.

 

[berkman858]

Me Too! It's just us some of us pot snobs put out this vibe that if you don't have a perfect room you can't do it at all.

Fuck that noise. You can do it, anyone can do it. It depends to what degree you want to bring your game. I want my game at the top notch level so I invest to get to that point. I never say you can't do it with less, I just say expect lesser results. It's all about what your goals are.

P.S. - By investment I am not only talking monetary; time, effort, and education count too.

 

[budleydoright]

Fuck that noise. You can do it, anyone can do it. It depends to what degree you want to bring your game. I want my game at the top notch level so I invest to get to that point. I never say you can't do it with less, I just say expect lesser results. It's all about what your goals are.

P.S. - By investment I am not only talking monetary; time, effort, and education count too.

Agreed. My point is simply that you don;t have to have 75 degree 50%rh to pull it off. If the best you can come up with is 85-95, under most circumstances this won't kill the plants just have an effect on the yield and quality. for many this is fine, for me not so much. I've hoarded so much gear i have 3 cea setups running at this moment. All with AC, Co2 when needed.

 

[montanamike1]

Optimal temperatures will be strain dependent; a pure Afghani will prefer lower temperatures while a descendent of a Thai, Cambodian, Colombian, or similarly thin-leaf varities will only thrive in higher temperatures. Since most strains are a mix, it will very much depend on what phenotype you have. If you cannot lower the temperature, try raising the humidity in the room. The plant will reduce its transpiration rate when levels of ambient moisture are high, which can induce the plant to close excess stomata on its own without curling "heat stress". Some growers refer to this high temp/high humidity as "jungle conditions" and have produced very impressive results- wish I could find a link right now...

 

[brotherjericho]

Here is my setup:

Dark Room DR150 II 60x60x80 Tent.

S&P TD-200 8" Round Duct Fan 538/476 cfm.

CanLite Filter 600cfm.

Sun System Cool Sun HID Reflector Air Cooled Hood.

Lumatek 1000w Ballast.

1000w Agrosun Super Red Sodium Bulb.

I have everything tied together with 6" insulated duct and the fan set to "high" setting, 534cfm. I have both passive intakes open with 2 fans blowing air at one of the passive intakes. The other passive intake unfortunately backs up to a wall for the most part. I also have an oscillating fan on the inside of the tent. This is how I have the exhaust setup:

Carbon Filter > Insulated Ducting > Air Cooled Hood > Insulated Ducting > Inline Fan > Insulated Ducting going about 4 ft out of the tent up by the air conditioners hot air return for the room.

During the day I can see temps of 95 degrees F in the tent even though ambient in the room is only 75.7 F. The room the tent is in feels nice and cool with good air flow. How come my ventilation is not getting the job done? Is 95 deg ok to grow in?

The most obvious problem I see is that you have an 8" fan hooked up to 6" duct. The fan is only rated at the flow rate you list when it is using 8" duct, you have reduced its capability by going smaller with your ducting.

 

[highasfvck]

Plants can take alot of heat.
My shed cab will get to 110' for a few months of the summer, same temp as the outdoor..
I seen green houses get to 120' an the plants were thriving.
Its not optimum, but they have evolved to handle the heat....

This is great news! I'm no where near those temps. I've grown in 90 deg temps during the summer and the yield and quality were great so I think I'm just gonna roll with what I have and see what happens.

I'm guessing you chose this fan because it's quiet. Most 8" inline fans put out 50% more cfm. Prob be better off with a bigger fan and insulate it to quiet it down.

Definitely because it was supposed to be quiet. While I'm sure it's quiet compared to other fans like a Vortech, but it's still way louder than I would prefer. Noise is a major issue to me, more-so than smell even. Most friends that come over to my house know I burn good bud so smell is explainable. If it sounds like I have a jet turbine in the spare bedroom, however, it's a little difficult to cover up.

So true! i think we get hyperfocused on providing optimum conditions at any cost. If you just use what you have, play the cards your dealt and do the best you can. You will have something nice to put in your bag at the end. It might not be as dense or as much but the rewards are still there for those willing to make it happen for themselves.

I've been doing this for awhile with an un-cooled hood and 600w without the tent (in a closet), the temps were actually a little lower, around 90 deg, but the buds have been some of the best quality I've seen and pretty dense too. Usually would get 8-10oz, so I was hoping to get up to 16oz with the tent and 1000w.

Optimal temperatures will be strain dependent; a pure Afghani will prefer lower temperatures while a descendent of a Thai, Cambodian, Colombian, or similarly thin-leaf varities will only thrive in higher temperatures. Since most strains are a mix, it will very much depend on what phenotype you have. If you cannot lower the temperature, try raising the humidity in the room. The plant will reduce its transpiration rate when levels of ambient moisture are high, which can induce the plant to close excess stomata on its own without curling "heat stress". Some growers refer to this high temp/high humidity as "jungle conditions" and have produced very impressive results- wish I could find a link right now...

I've done many different varieties with my old setup. The first ladies I had planned to go in this new setup were 15 Blue Mystic. I have no idea which phenotype those would fall under. What humidity would you suggest and what's a good way to regulate it?

The most obvious problem I see is that you have an 8" fan hooked up to 6" duct. The fan is only rated at the flow rate you list when it is using 8" duct, you have reduced its capability by going smaller with your ducting.

I knew this would be somewhat of an issue, but unfortunately I would have to put reducers somewhere regardless. The hood has 6" vent holes as well as the exhaust ports on the tent will only fit 6" insulated duct. I ended up deciding it would just be easier to reduce right at the fan.

 

[highasfvck]

I also want to mention this is peak temperatures that would occur under worst case scenerios. If I open the door to the spare bedroom that the tent is in a little bit the temps drop a decent amount. As long as it's just the wife and I home I planned on leaving the door cracked open to let more fresh air in. I would imagine the plants would only be exposed to the highest of temps a few hours a week. I plan on keeping the room closed up when I'm not at home as well, but since I'll be running at night, I'll be home most the time.

 

[@bong]

The tent is in a corner so if I turn it I will just block off the other vent. I could try opening the door or window of the tent a little to allow a little more air in though. What do you think about that? Is there a way I can test if I even have negative pressure in the tent?


neg pressure will b sucking the tent inward on itself.
my opinion you should get a little 6"inline fan, duct from a open window then hav that blowing up on your bulb, I was having the very same problem in my 5x5 but have it sorted now...
Or go spend 100$ on a cool tube?

 

[Sean Tom]

Just a word of caution, beware of changing the photo period too much at once. It can stress them out just as much as heat. If you are running 24/0 and just switch to 12/12 at night that's fine but if you switch from 8am-8pm to 9pm-9am, that could be very stressful for your girls.

always right on par Berk. u dnt want seeds n yo greens

 

[augurlord]

anything over 90f isnt real good for them...i run mine on a night cycle to help with heat. i also use a 120v furnace blower fan which keeps mine under 85 i also have a plate of glass seperating my lights from my plants. so while the upper area is 95 and above the lower only runs 85 and under..i m currently running a 150 hsp but i usually have a 400watt on it andit maintains the heat well.

 

[mr.smileyface]

I run a tent setup twice the size of yours and here is what i do..
I Have a 4x8 2000w tent with two cooltubes. Instead of venting your lights with your filter, Get another fan for the filter and vent the lights seperate with differnt air. For example. I put tent in corner of room. Stapled up a poly wall so right when you walk in you see a black poly wall with ducting sticking out(thats for the lights). then a zipper on the other side. a 6inch inline max fan and 6 inch duct booster/axial fan for the lights and then a 6 inch inline to match the filter inside the tent to vent accumulating heat humidity and smell. Both venting outside the room. I also have a 4inch fan and small filter on a thermostat to vent hot air outa the tent into the room itself. Im gonna upgrade to a 1 fan swamp cooler(aka 1fan chiller). Then switch the fan it comes with to a low db axial fan.
hope this helps.

 

[highasfvck]

Everyone keeps suggesting another fan, but there's just no way possible I can take on anymore noise whatsoever.. It's way way way too loud as it is.

If there's no other way I would rather just get rid of the filter and concentrate more on heat and noise than smell.

Speaking of noise, is it safe to wrap my inline fan in dynamat to quiet it some? I'm afraid that it already gets really hot, I don't want to trap more heat in it and break something..

 

[highasfvck]

Everyone keeps suggesting another fan, but there's just no way possible I can take on anymore noise whatsoever.. It's way way way too loud as it is.

If there's no other way I would rather just get rid of the filter and concentrate more on heat and noise than smell.

Speaking of noise, is it safe to wrap my inline fan in dynamat to quiet it some? I'm afraid that it already gets really hot, I don't want to trap more heat in it and break something..

If I did just decide to get rid of the carbon filter, where should I pull my air from to go through the light? Just out the port on the other side of the tent?

 

[budleydoright]

there are many ways to quite a fan. Even a loud one. My 8" vortex doesn't get hot at all. I have wrapped it in moving blankets with no problems. That is why I am suggesting a fan that is engineered for max effeciency instead of least amount of noise produced. You need the CFMs and can stick the fan in a rubbermade tote and fill it with insulation to quite it down. We can quite them down but we can't increase their output.

I started my first grow in March a few years ago, it's just going to continue to get hotter be prepared.

Even if it get's real hot in there, if you manage everything and keep good air movement you'll still succeed. The penalty for too hot a room isn't certain death. It's lighter fluffier buds in most cases. If your growing your first crop and your all in, don't be discouraged it will still smoke fine. And like a broken clock is right 2 times a day. Your system will likely have conditions were everything is perfect throughout much of the year.

Lots of people shut down in the summer for this very reason.

 

[highasfvck]

there are many ways to quite a fan. Even a loud one. My 8" vortex doesn't get hot at all. I have wrapped it in moving blankets with no problems. That is why I am suggesting a fan that is engineered for max effeciency instead of least amount of noise produced. You need the CFMs and can stick the fan in a rubbermade tote and fill it with insulation to quite it down. We can quite them down but we can't increase their output.

I started my first grow in March a few years ago, it's just going to continue to get hotter be prepared.

Even if it get's real hot in there, if you manage everything and keep good air movement you'll still succeed. The penalty for too hot a room isn't certain death. It's lighter fluffier buds in most cases. If your growing your first crop and your all in, don't be discouraged it will still smoke fine. And like a broken clock is right 2 times a day. Your system will likely have conditions were everything is perfect throughout much of the year.

Lots of people shut down in the summer for this very reason.

I've been doing this for a couple years now, just with a 600w instead of a 1000w. Since I have a modern home with good insulation, central heat and air conditioning the inside temperature of my home is pretty much 72F regardless of season. My grow room previously with the 600w hardly noticed a difference between summer and winter.

It doesn't get very cold here in the winter though. I'm in a tropical area. Someone here had mentioned in-taking air through a window, which because of this would be a terrible idea lol. Most the time I would be sucking in air that is 90F and very humid lol.

I often think of how much easier indoor growing must be up North!

 

[budleydoright]

I often think of how much easier indoor growing must be up North!

I know, they have unlimited ice cold water too. I live where in the high desert. It will be 90 during the day and 50 at night. I'll be in the low 100's soon.

I've been doing this for a couple years now, just with a 600w instead of a 1000w. Since I have a modern home with good insulation, central heat and air conditioning the inside temperature of my home is pretty much 72F regardless of season. My grow room previously with the 600w hardly noticed a difference between summer and winter

You pretty much described insuffecient CFM's right there. Your AC should be able to absorb it no problem, you just got to keep increase the airflow. A 1k is WAY hotter than a 600 and it throws that heat.

 

[PSUAGRO.]

Well if your willing to forgo the smell issues(are you in a medical state/country??) then yes removing the scrubber will increase your cfms by 30-35% generally speaking with a marginal temp drop........I don't understand why your concerned about noise level and yet your willing to remove the scrubber.....is stealth not an issue??or are you sleeping near your grow???

good luck and be safe......

 

[Dutchmast3r]

ya who ever said those fan are "quiet" f*ck u! i sleep where my tent is and its fucking loud i mean my lights go off at 12am but if i gotta work early its a bitch some times i just let em sweat for the last 2 hours if i gotta sleep lol ( not suggesting that at all) i run a 400w and it only get like 85F without the fan...im about to go 2 600w next time tho

 

[BeaverHuntr]

You can buy mufflers for your can fans and what not.