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RandyWatsonJr
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Thanks dood. How do you have yours scheduled to exchange the air? Is it true you want the air exchanged once every 5 mins or so? If so, does that mean the fans run 12 mins per hr in 1 min increments every 5 mins, and then shut off?I run an 8" exhaust and 6" intake in a 8x4x6.5
10x10 I would use a 10" exhaust which is 1200cfm at full speed(for an AC Infinity T10 fan anyways).
If you want an active intake, 8" for the intake would be good.
Make sure the tent you get has the proper duct opening sizes for a 10".
The room the tent is going to be in, can you heat and cool it to keep temps in check during winter and summer and when lights are cranked up in flower?
I run my fans 24/7, some people will cycle them off for 15 mins every hour. In flower you definitely want to run 24/7, no odor control if the exhaust is not running.Thanks dood. How do you have yours scheduled to exchange the air? Is it true you want the air exchanged once every 5 mins or so? If so, does that mean the fans run 12 mins per hr in 1 min increments every 5 mins, and then shut off?
Sorry for the noob question/s but what do you mean by active intake? Like it's always active?
The room the tents are going in (I'll have 1 flower tent, 1 veg/mother/clone) is typically low 50's during the winter months and low/mid-60's in the summer months. In addition to humidifier and dehumidifier I also plan to have a window AC unit and possibly some sort of space heater or radiator.
Bingo - this is what I was after. Thank you! I'm getting a trolmaster to monitor and control all of my environmentasl. No co2...yet.Negative pressure is when your tent walls suck in a little bit, to create this all you need to do it open flaps on the bottom of the tent and the exhaust fan will do the rest.
The other way to create negative pressure is to run an intake fan that's smaller/lower speed then the exhaust fan. If you were to do this I would recommend a 10" exhaust and 8" intake for a 10x10.
Either method works, the first method is more common. I use the second method.
10" inline fan with around 1200 cfm will work good for an exhaust for a 10x10 grow tent and gives you enough cfm that you don't have to run it full blast. You want a fan that has a speed contoller or better yet a temp and humidity contoller. You won't be running the fan full blast all the time, depends on temp, humidity, etc.
I prefer AC Infinity. I linked a 10" fan with controller.
There's many brands out there but I personally recommend AC Infinity.
CLOUDLINE PRO T10, Quiet Inline Duct Fan System with Temperature Humidity VPD Controller, 10-Inch
Your source to create smart growing systems with components including advance grow tents, inline fans, clip-on fans, LED grow lights, and UIS™ controllers.acinfinity.com
confirming I only need a temp/humidity controller for the intake and not the outtake fan?Negative pressure is when your tent walls suck in a little bit, to create this all you need to do it open flaps on the bottom of the tent and the exhaust fan will do the rest.
The other way to create negative pressure is to run an intake fan that's smaller/lower speed then the exhaust fan. If you were to do this I would recommend a 10" exhaust and 8" intake for a 10x10.
Either method works, the first method is more common. I use the second method.
10" inline fan with around 1200 cfm will work good for an exhaust for a 10x10 grow tent and gives you enough cfm that you don't have to run it full blast. You want a fan that has a speed contoller or better yet a temp and humidity contoller. You won't be running the fan full blast all the time, depends on temp, humidity, etc.
I prefer AC Infinity. I linked a 10" fan with controller.
There's many brands out there but I personally recommend AC Infinity.
CLOUDLINE PRO T10, Quiet Inline Duct Fan System with Temperature Humidity VPD Controller, 10-Inch
Your source to create smart growing systems with components including advance grow tents, inline fans, clip-on fans, LED grow lights, and UIS™ controllers.acinfinity.com
If you're running both an exhaust fan (outtake fan) and intake fan, you will want a controller for each.confirming I only need a temp/humidity controller for the intake and not the outtake fan?
This is where my head wants to explode, thinking about all the variables and facts/opinions you find online.10 x 10 x 6.5 = 650 cubic feet of space.
You want from 1 - 3 air exchanges a minute.
You'll need a fan that can move, at minimum, 650 cfm.
I've never had the need for an intake fan other than the environment the tent is in doesn't allow me to open up the bottom flaps to let air in because of light leaks or whatever other condition doesn't allow you to be able to open the bottom flaps. I've seen setups where they use a cardboard box at each flap opening with one side open to block light and still use the bottom flaps.
The T10 says it'll move 1200cfm at full speed so at full speed you should be exchanging 2 times a minute.
You can set your controller to auto first setting up the parameters you want the tent to stay at or, set the fan to On and spend a little time dialing in the fan speed that gets you to the environmental specs range you want your tent to be at.
Thats why it's important to have the intake adjust with the exhaust.As far as fans counteracting, your exhaust will overwhelm your intake and pull whatever the physics of the air inlet diameter will let you.
Again, I don't use intake fans. I rely on the exhaust fan to pull enough through the flaps.
How do you regulate the intake in relation to the exhaust? The flaps should have enough cfm to be able to accommodate your exhaust fan at full speed.Thats why it's important to have the intake adjust with the exhaust.
I have cfm relation to speed charts for my fans so my intake cfm is always at the proper level compared to the exhaust cfm to keep proper negative pressure. If exhaust cfm raises, my intake does automatically also.
I can't be home all the time to open more passive flaps to allow more air in if exhaust speed has to go up, this is where contol of the lung room needs to be handle well.
I gave enough info of Active systems so I'll just leave this post as my final thoughts on it and people can make the best decision for there particular setup and environmental factors.
I have an ACI Controller 69 that I control both with. My 8" exhaust runs at a minimum of 3 and my 6" intake minimum of 4. If my temp hits 78, the controller automatically raises both fans 1 speed setting, if temp climbs more and reaches 80 then they both go up another speed setting. Every 2 degrees higher the temp gets, the speed of both fans increase by 1 level.How do you regulate the intake in relation to the exhaust? The flaps should have enough cfm to be able to accommodate your exhaust fan at full speed.
Depending on tent size, your passive intake size can be to big for lower fan settings My tent has 4 big passive flaps at the bottom (bigger chance of light leaks), running all 4 open all the time with the exhaust at level of 3 is not going to be at the proper negative pressure because the intake flaps are over sized for how much air is being pulled out. I would have to either run my fan at much higher speed all the time or I would have to keep some shut to maintain the proper ratio of air coming in and out and if temp increases and the fan speed goes up, I would have to open more flaps to keep the negative pressure consistent and I can't do that when I'm not home.How do you regulate the intake in relation to the exhaust? The flaps should have enough cfm to be able to accommodate your exhaust fan at full speed.
Why don't you want to run the exhaust 24/7? Without it running, you can't control tempature, humidity, and you stop the exchange of fresh air.
Also important to mention there's no odor control if the exhaust isn't running because you would be sucking nothing through the filter.
If you're worried about electricity cost
If you are worried about the noise, AC Infinity inline fans are very quiet. I have 4 AC Infinity inline fans running 2 tents in 1 room of my house and I can not hear them running, even if I'm right next to the door to the room. You can hear them when you're inside the room but you could talk to someone in person or on a phone and not even notice they are there.
There's countless different ways to setup and run grow tents, what works for 1 person might not work for another. I can only tell you what works for me and what I've learned along the way from making mistakes, researching, and getting help from others.
He may have been giving advice for co2, I don't run it so I can't say.Honestly I’m starting to question the person who gave me the every 15 min advice regarding the fans, although maybe he meant for when/if I introduce the tents to co2? Either way, you have me convinced to run a 10” and 8” fan - the larger pulling air out.
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