400w Club-Show Off Your 400w Pride And Joy

stinkbudd1

Well-Known Member
Home Depot also have 6" and 8" inline fans - maybe go with one of those if you don't feel it'll be cool enough. If you can't find them there, Lowes or Menards also have them.
hey whats up doeEyed where you been friend? good to here from you look i got mine from home depot and they had not one 6" or above i went for that first since my cool tube is 6" round lowes had none instock only online so i settled for the two 4" and got 2 reducers 6 to 4 in to set them up..so what do you think its still 160 cfm's only split between pulling in and pulling out...has anyone ever done this with two fans..ppp
 

DoeEyed

Well-Known Member
If you're using them just for your lights, and not for the room exhaust as well, I think you'll be fine.
 

stinkbudd1

Well-Known Member
If you're using them just for your lights, and not for the room exhaust as well, I think you'll be fine.
yes its strickly for the cooltube the room has its own exaust and passive intake seperate..i dont mean to sound to newb but its my first real go round with hps and it is 400w..ppp thanks
 

Integra21

Well-Known Member
You should be fine with those 4" ones. I just build a 600w room for a friend and all we had laying around to cool the light was a 8" duct booster, which has very low cfm's, and it cools the light effectively with a standard shaped air cooled reflector, which doesnt have as smooth an airflow as a cool tube and is on a 600w light. so in short, no worries.
 

hardroc

New Member
You should be fine with those 4" ones. I just build a 600w room for a friend and all we had laying around to cool the light was a 8" duct booster, which has very low cfm's, and it cools the light effectively with a standard shaped air cooled reflector, which doesnt have as smooth an airflow as a cool tube and is on a 600w light. so in short, no worries.
I use a Cyclone booster I bought from home depot, for around $30. I just hang it under my reflector and it blow as a 45 degree angle so it's perfect, it's cfm is 120 I think, works great
 

Reiss

Well-Known Member
My white widow is on day 13 of flowering under 400w HPS and has grown 16cm!
Complete journal in my sig.

 

Reiss

Well-Known Member
Thanks guys.
I'd highly recommend building a screen if you can, looks like I'm going to get a really nice harvest out of this. Integra's scrog looks impressive too!
 

Integra21

Well-Known Member
yeah, there's something that just looks so sweet with a proper scrog having that organized field of buds. mine looks ok now, but will look fantastic in about a month.
 

stinkbudd1

Well-Known Member
ok you all i just got my toys in today and cant wait to get get the party started im not going to hook it all up until i go to flower but here is what i have..my set up 2x3x4 box 4" 80 cfm inline fan for box exaust with passive intake..6" oscilating fan for air cir. 400 watt hps/mh electronic ballested cooltube complete unit only one bulb for now hps.2 x 4" 80 cfm inline fans for the cooltube one to push cool air from outside box and one to pull that air through the cooltube for extra cfm.4" carbon filter for box exaust. if anyone has any concerns about the set up or ideas please let me know first time hid user..peace pot prosperity...do i need more?
 

DoeEyed

Well-Known Member
Oooooh fun! I say hook it up! I don't know how long you're planning on vegging, but even a week or two under that 400w will make a difference - go for it!
 

stinkbudd1

Well-Known Member
Oooooh fun! I say hook it up! I don't know how long you're planning on vegging, but even a week or two under that 400w will make a difference - go for it!
hey i think ill follow your advice i cant wait myself im like a fat kid sitting in front of his favorite cake...its going up this weekend when i have time..thanks ppp
 

groputillor

Active Member
this is my baby 2 weeks into flower
Your "baby" is kinda fat. Kinda really fat. lol is that really one plant? How long did you veg for? Eventually I will grow only a few huge ones under a 600 watt light for each one like Mblaze. It's just so cool to see a bud plant get so big.

Happy Flowering!! :weed:
 

groputillor

Active Member
You don't persay need two fans but then your gonna have to be at the house every day twice a day when the light comes on and when the light goes off to open and shut the passive intakes. I'm currently in a growlab tent the 2x2x5'3". It gets mighty hot in there so I use two exhaust fans. Works great with the way I have it set up. Next grow season I plan on buying another inline so I don't have to open the vents and what not.

:leaf::peace::leaf:
No no no . you can use one fan and not have to be around for anything. You can see the fan set up i use in the pic. The intake is passive but I use a 6" alum flex tube. Its stretched out to say 8 feet along the floor in a few s turns so no light will bled up the intake. Works great and no light leaks. .
I agree to disagree there man. In my case YES i have to be here twice a day. Your tent looks twice as big as what I was talking about. I've tried what you suggested it didn't work. My fans suck the walls of my tent in very hard during the off hours, and thats just with the carbon filter fan running not counting the fan to cool the light.

:leaf::peace::leaf:
Hey any pros in here? i was wondering if i had 2 400w hps with cool tubes and both have a 6'' 250 cfm inline fan sucking air to the attic and a 8'' 325 cfm inline fan blowing air from another room into my 10 sf 6 foot tall room with 12 plants 6 in 2 dwc resevoirs with technaflora nutrients. do you think thats a good setup and do you think my yemps will be okay? like is it enough cfms? Thanks
I have a question, If I get a 400w and plan to use it in an open room (im growing autoflowers so there is no need for a grow location that hides light) will it get really hot in the room. Its an average of 70 degrees in the room and its an average sized 2nd bedroom, would I need ventilation.. or would simple fans be fine. Im only asking because I plan on working from the same room... there is a computer desk in the far corner and I will be taking calls from home... just wanted to know if the light was loud and if I would DEF NEED a blower?
The answer is that you have to figure out your own environment. I've set up two different spaces a few miles apart and they are VASTLY different. My recommendation to the guy who hasn't started is to get the light only first, turn it on in the room, monitor temps, add fans and ducting as you can afford and as you conceptualized how to duct them.

There are homemade equations out there that are supposed to help. They uses the cubic feet of the room (duh) and the light wattage to tell you the acceptable cfm's but they are rough estimates at best, and based on that person's experience in thier space. We all want to know what we need before we start cutting into our wallets and homes, but as far as I can tell, there is now way around it. You just have to trial and error it.

GreenFire - I FINALLY don't have to be at my house every 12 hours!! Check out how I did it on my journal. I live in a hot area as well, where - sorry Doctor D, but there is NO WAY one could keep a 400w tent closed with one small fan on the light that doesn't even pull cool air from outside the tent through the light, but rather hot air from inside the tent..? You really keep that thing under 80 with it shut?! I'm moving Northward!! Tonight!

GFK, I still havn't seen your setup in full, but the answer for us is exhausting the tent and the light with as much cfm's as is affordable, and always pulling that air from outside the tent. Here's an idea: I remember you said you use your central air to keep temps down. If it's cool enough to live comfortably without it now, why not duct one AC vent - the one in the room you're using - into the light or the tent or both (for both use a Y connector duct). Then close all the other AC vents and turn it on like pretty low. I'm doing this at a friends apartment now.

You don't NEED two fans to exhaust both the tent and the light. You can use a Y connector duct for that, too. Just make sure it's a pretty strong fan. Two's prob better I'd guess.
 
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