1000w 4x4 Grow Tent; Venting it cool..

You need to exhaust to an attic or to an outside window, etc., somewhere not in the same room as the tent.

 

those booster fans will move 250cfm with no ducting attached. Their effectiveness drops off quickly when you add ducting and a few turns. I don't think you can cool a 1000 with one of those unless there is no ducting attached.

 

Ya I agree....
I have a 600w that I use two of the duct booster fans (on intake and exhaust) and the tent stays in the upper 70s to lower 80s... But the 1000w lamps produce MUCH MORE heat than the 600w lamps....

I personally would use a 6"/400cfm inline blower behind the lamp so it is sucking the heat out of the hood..

 

Just bought an 400cfm active air 6'' intake for my 600. My grows in a closet and it gets hot quick. Are you able to vent outside? Just venting to my attic let the temps drop like 4 degrees w/o fan on. You could put a Y on venting so you can pull from tent and light or just leave other end of light open and it will pull air through light from tent.

I would also look into dimmable ballast. My 600 is on 450 and rooms 75* with fan in window and closet door open. Hopefully i can run at 600 with intake fan running during flower.

 

If your ambient temps in the room stay below 68 you could get away with running just 1 fan like you suggest, I would recommend venting to the attic though, just to get rid of the CO2 depleted hot humid air. With this kind of set up you probably want a good fan speed controller, as controlling temps will be harder. If you went with 2 fans, you could probably use a 6 inch to cool the light and a 4 inch (170 +/-cfm) to control temps in the grow space.

 

IMO it is best to separate the lamp cooling from the chamber's exhaust...
From my past experiences by doing this you can get up to a 10 degree drop in chamber temps... It also (IMO) saves on the filter because the blower does not run as often or as long...


What I shoot for is to have the chamber's exhaust to come on every hour or so and run for 5-15 minutes before shutting back off to maintain 76-80F...


I use a 6" 400cfm inline blower on both lamp cooling and chamber's exhaust..

So I use on my lamps:
Intake -> duct -> lamp -> blower -> duct -> outlet

If heat is still an issue, I add another blower to the lamp cooling:
Intake -> blower -> duct -> lamp -> duct -> blower -> outlet

Then the chamber's exhaust:
Filter -> blower -> duct -> outlet


When venting, you want to suck and vent to outside the room which the chamber is in, so you're not just sucking the exhausted heat back into the chamber...

 

Two blowers (1 for lamp cooling and 1 for chamber exhaust) IMO is not an overkill...

Rarely do you need to add another blower to your lamp's cooling, most of the time if you have that much of a heat issue, and if you're in the mid to upper 80s, maybe go with some Co2, then normal operating temps with Co2 should be in the mid to upper 80s...


If you wanted to use just one blower:
Filter -> duct -> lamp -> blower -> duct -> outlet

 

id say grab a 8 inch vortex....10 yr warrenty, i think 700cfm. then grab a automated fan speed control with a temp probe and it will do the rest. plus if you ever add a tent or go to a room grow those in lines can cool a few hood lights.

remember you can slow a fan down, but you cant speed it up. lol. go big the first time and you wont have to again.

 

My first grow was a 1k all the thru in a 4x4. It ended great at just under 26 zips from only 6 plants. The payoff is totally worth it but you have to keep it cool. A lot of people dont realize how much heat a 1000 watter really throws out. I had 2 fans to exhaust.
One for tent air from scrubber
One for light only to outside exhaust
(unless you have a large room you will have to exhaust outside or to another room)

On top of those two fans I ran a 250cfm (supposedly) intake duct booster into the tent and 160cfm duct booster into the light.
the room my tent was in only had one window so I had to have some funky bends in my exhaust.
I also ran a 1100w ac unit inside the tent to keep my temps pretty low around 74 to 78 degrees

I agree with what jakesterjammin said you will need 2 fans.
if I were to do it again I would shoot for 8 inch for the light and 6 inch for tent.
Its not something you wanna be messin with when you got donkey dicks damn near at the light

 

I have an HTG setup. The booster fan is crap. I use a 435cfm econoline blower and it works great on a 600W. imho 1000w in a 4x4 tent is a bit overkill. Check my sig for a link on what you will get with a 600w HTG setup.

ODP

 

I still think your making a mistake with the 1000w in that tent. With the huge reflector and hanger you are loosing 1.5'. Add another 1' for light distance. Thats 2.5 feet of grow space gone right off the bat. Add pot hieght - There goes another foot. That leaves 3' for your plant size based on a 6.5' tent. Bad Idea.

That and the heat issues.

Go 600w. Cool tube. And regain a bunch of lost growing space.

ODP

 

You may want to do some more research on minimum light requirements because your honest opinion is wrong...

A 4x4 chamber with a 600 watt is only 37.5 watts per sq ft...
Well under the suggested minimum light requirements...

 

take his advice... I got put on blast in another thread and he had the numbers and proof to back his claims..... apparently a 5x5 needs 1200 watts....

 

Perhaps you should look at my link in my sig. So much for suggested requirements lol. Way too funny man. That has to be the funniest thing I have seen posted on this forum.

I'm estimating a 1lb harvest this grow with a 600w bulb and a 4x4 tent.

Too funny man....

Your math needs a bit of work.

ODP