Exhaust in a grow tent question

Is there a difference in either setup for keeping heat down. I do know and understand the correct way to install this, but lets just assume only one of these two scenarios is possible.

1) Air cooled hood and carbon filter in the same line exhausting 24/7.

2) No air cooled hood, just a carbon filter exhausting 24/7.


On a similar but separate note, can the exhaust be blown approximately 20' vertically?

Thanks for the consideration

Hi Long Dogg

Long Dogg said:

Is there a difference in either setup for keeping heat down. I do know and understand the correct way to install this, but lets just assume only one of these two scenarios is possible.

1) Air cooled hood and carbon filter in the same line exhausting 24/7.
Most effective method, a secondary exhaust can be installed (independant of cool tubes) if temp still an issue. If ambient outside temp is low, rig ext fan to timer with lights to go off at lights out or temps with plumet.

2) No air cooled hood, just a carbon filter exhausting 24/7.
FIne if temp is not such an issue.


On a similar but separate note, can the exhaust be blown approximately 20' vertically?

Increased ducting length = increased work for ext fan. Ducting ribs creates resistance. 20m will work but use bigger fan and the less bends the better.

Thanks for the consideration

Click to expand...

Now a little more detail, two 1000's in cool tubes in line with the carbon filter going up approximately 20' with maybe one 90 degree bend. All being blown by a six inch 334 cfm.
Too much?

Long Dogg said:

Now a little more detail, two 1000's in cool tubes in line with the carbon filter going up approximately 20' with maybe one 90 degree bend. All being blown by a six inch 334 cfm.
Too much?

Click to expand...

Not the most powerfull fan but like I said, you have room to add another independent of the filter.

With 2 x 1000w I would go for a straight through setup on the lights, fresh air across lights and out. Secondary fan pulling through the filter.

Why?? Because the filter also creates resistance + ducting, ya cfm on current fan will drop right down and may not do what you want it to do. Also, big heat off 1000's. I would go 3 x 600w, cheaper to run, better ight spread, more efficient and more control if you need less light.

Ok......One! 1000w in a 4x8 tent. An adjust a wing reflector (bare), 24/7 exhaust with an 8" fan blowing at 667cfm.

Covering a 3x6 footprint RDWC.

What say you?

I have a couple of 600's, they serve their purpose well. I would like to try larger plants, so I am looking for extra light penetration.

Thanks again

Long Dogg said:

Now a little more detail, two 1000's in cool tubes in line with the carbon filter going up approximately 20' with maybe one 90 degree bend. All being blown by a six inch 334 cfm.
Too much?

Click to expand...

you're running this for your ventilation as well as cooling? So its Filter >1000w >1000w> fan>duct >exit?

you need a bigger fan. 334 cfm isnt enough to cool all that.... unless you live in the snow or something, in which case the heat won't matter. but like the dude up there said, all that ducting will reduce CFM, i'd get a bigger fan if possible.