Intake fan or no?

Hi I have a 4x8 room 600 HP's two LEDs at 1500(bullshit) watts and I got a carbon filter vertical on a bucket and venting out he room, the smells gone and the heats down. I also have oscillating fans. My question is do I need to make an intake and get a fan? When the 600 is on full blast not dimmed the temperature will crawl to 31 ...thanks
 

Roger A. Shrubber

Well-Known Member
what CFM is your fan rated at? and your filter?
you want negative pressure, and having an intake fan makes it harder to get negative pressure.
it may not be financial viable at the moment, but your best bet would be to get a bigger filter and fan. its a good idea to get a bigger filter than you need, and a fan that is rated at just slightly lower cfm. that way you can't over power your filter, and on all but the hottest days, you have room to dial it back some, which makes it run quieter.
you want the fan to pull just slightly more air than its getting through your vents, that's "negative pressure". it keeps the smells in the tent and exiting through the filter, not leaking out into your house. an intake fan makes it harder to keep this happening.
your filter will work better at removing heat if you hang it near the ceiling. if its sitting on top of a bucket, its pulling cool air out of the bottom of the room, and leaving the heat at the top of the tent to build up during the day.
 

Roger A. Shrubber

Well-Known Member
also, do you have the fan and filter pulling through your light? or is it just sitting there on the bucket not hooked to anything but the exhaust?
 
I have had it.hooked.from ceiling, and on bucket, believe it or not it keeps.temps lower on the bucket and ducted out the to, also for me atleast it controls.odor there better. Dunno the CFM it 6" fan and 6 filter, I wanna lose some led light and add another 600 watt but can't with the temps that's why I think I need the intake vent. The exhaust ain't on the light it isn't that type of light I can't hook it on it but I have oscillating fans pointing at it
 

Roger A. Shrubber

Well-Known Member
i HIGHLY recommend looking into vented cool tubes, they aren't very expensive, and they really help keep the heat down, while allowing your plants to come within 6-8 inches of the light without burning.
if you put another unvented 600 watt hps in there, theres no way you're going to be able to control temps
 
But there is a lot of grows I've see with watts as high as 1000 on reflector with no cooling...I can't physically hook it to a vent nor afford new lights, so I think my best bet is blowing cold air from the outside into the room and Continhe using the exhaust and filter
 

Gquebed

Well-Known Member
But there is a lot of grows I've see with watts as high as 1000 on reflector with no cooling...I can't physically hook it to a vent nor afford new lights, so I think my best bet is blowing cold air from the outside into the room and Continhe using the exhaust and filter
Those rooms are generally sealed and using co2, which allows for higher temps, but they are cooled with a/c units.

There are only 3 ways to cool your space. A/c or move lots of air. Or both.

I run 2x1000w in a 5x9 space. The hoods are air cooled and vented outside. I use a window a/c unit. And i have a fresh air intake from outside that is balanced for neg pressure with an exhaust fan.
 
Those rooms are generally sealed and using co2, which allows for higher temps, but they are cooled with a/c units.

There are only 3 ways to cool your space. A/c or move lots of air. Or both.

I run 2x1000w in a 5x9 space. The hoods are air cooled and vented outside. I use a window a/c unit. And i have a fresh air intake from outside that is balanced for neg pressure with an exhaust fan.
Welll then with all due respect, an intake would move cold air in would it not? Meaning an.intake definitely willl help cool the room
 

Roger A. Shrubber

Well-Known Member
well, the thing is, 99% of people are concerned about two things, odor and temps.
if you don't care that your whole house reeks of skunks fucking old cheese in a garbage heap, then do whatever it takes to cool your area.
you have it set up the way you want it already, so keep going...if you want an intake fan, put one in. when it makes the whole house, and probably your yard reek of weed, thats when you have to decide if its worth it or not
 
well, the thing is, 99% of people are concerned about two things, odor and temps.
if you don't care that your whole house reeks of skunks fucking old cheese in a garbage heap, then do whatever it takes to cool your area.
you have it set up the way you want it already, so keep going...if you want an intake fan, put one in. when it makes the whole house, and probably your yard reek of weed, thats when you have to decide if its worth it or not
chill out...im new to things. I want to know why what or where before doing it. Dont get your pantys in a bunch
 

Roger A. Shrubber

Well-Known Member
not trying to be a dick, guess it comes naturally...i also have the flu at the moment, which doesn't help at all.

if you think your idea will work, try it, i'm not aware of all the conditions you have to deal with, maybe it'll be enough. try it and if it doesn't work, come ask some more questions
 

Gquebed

Well-Known Member
Welll then with all due respect, an intake would move cold air in would it not? Meaning an.intake definitely willl help cool the room
I arranged my intake fan and exhaust fan in a way that removes that problem, plus eliminates condensation.
I put two 4 inch holes in a piece of plywood and fit it into the window. The top hole exhaust warm air from the tent well the bottom hole sucks in cold air from outside. Sometimes that cold air can be as cold as - 20 Celsius. When the fans come on simultaneously the intake sucks some of the warm air back in. It's warm enough to keep from causing condensation on the ducting and the fan and cool enough to cool the room which take some of the stress off my air conditioner. That happened quite by accident but it works well.

Also unlike most people I have the cold air intake mounted High in my tent so it mixes with the hot air. A 12in oscillating fan mounted High circulates that air down low which eliminates hot spots in the room and evens out the temperature. My exhaust is down low which helps that top to bottom circulation.
 

Toohighmf

Well-Known Member
what CFM is your fan rated at? and your filter?
you want negative pressure, and having an intake fan makes it harder to get negative pressure.
it may not be financial viable at the moment, but your best bet would be to get a bigger filter and fan. its a good idea to get a bigger filter than you need, and a fan that is rated at just slightly lower cfm. that way you can't over power your filter, and on all but the hottest days, you have room to dial it back some, which makes it run quieter.
you want the fan to pull just slightly more air than its getting through your vents, that's "negative pressure". it keeps the smells in the tent and exiting through the filter, not leaking out into your house. an intake fan makes it harder to keep this happening.
your filter will work better at removing heat if you hang it near the ceiling. if its sitting on top of a bucket, its pulling cool air out of the bottom of the room, and leaving the heat at the top of the tent to build up during the day.
I personally like positive pressure in a sealed room and running my carbon with a seperate fan to scrub the area and not vent, which only invites bugs & pathogens through the room. Aircool the light, but don’t suck the cool air or co2 out the room by exhausting more than just the lights. I prefer to scrub the the area outside the tent or room where it matters most, without sucking out the environment I’m tryin to create.. the straighter the shot through and out, the less restrictions you’ll deal with and you won’t lose 1/2 the power of your fan trying to scrub through the filter, while blasting your carbon dust through the hood.
 
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