Why do Grow Tent MFGRs put the exhaust holes in the middle center of their Grow Tents?

I've always wondered about this since recommended setup of exhaust and carbon filter is inside the Grow Tent at the top where the heat and humidity is.
The recommended setup says to place in the tent at the top and in all the pics I have ever seen and including my own setup its placed at the top rear of the grow tent.

They also say to keep everything straight for maximum CFM airflow. So if you put it in the top rear your exhaust vent is either curved 90 deg to the big hole at the top rear of the tent or curved 45 deg to the vent in the center top which is how I have mine.

If you put your exhaust and carbon filter in the top center then youre losing height that you can grow your plant because you wouldnt be able to raise your light as far. Now if you used to LEDs for 2X4 coverage maybe you can put one on each side of the exhaust setup. But I have a 4X4 LED light in my 4X4 and theres no way I could put my exhaust setup in the center without losing like 12-16 inches of height.

So why are the holes for the exhaust in the center and not in the top rear of the grow tent?

This is a Zazzy 4X4 Grow Tent which I just recently purchased because my other grow tent the mylar inside started to peel off in one spot and the zipper has light leaks. The Zazzy tent has way better diamond mylar, no light leaks especially the zipper and the zippers are way better quality. Also the exhaust holes are towards the top rear of the grow tent where I put my exhaust.

This one is the Zazzy 4X4. Exhaust port at top is more rearward.





Heres an example they show where to put your setup but man youd need 2 smaller lights instead of one big one.

I use a duct coming out of the top of the tent to a fan and filter i have just sitting on the ground like Floor>filter>fan>duct up side of tent>180 into the top. i never have to run the fan past level 2 its not sucking a crap ton of humidity through it and its quiet. My ac infinity tent also has its top vent in the rear right corner

gooshpoo said:

I use a duct coming out of the top of the tent to a fan and filter i have just sitting on the ground like Floor>filter>fan>duct up side of tent>180 into the top. i never have to run the fan past level 2 its not sucking a crap ton of humidity through it and its quiet. My ac infinity tent also has its top vent in the rear right corner

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Thats cool. I thought about putting one on the floor but heat rises and CO2 is denser and is at ground level. Which is why they recommend putting a fan on the floor to circulate the CO2 upwards towards the leaves for the plant and to help prevent humid spots under the canopy. Cooler air sinks too.
Ill have to check out the AC Infinity tents next time I need to replace one. I like their exhaust fans and carbon filters. Very quiet.

I keep everything (other then small oscillating fans) outside the tents for optimal space

wallywonks said:

Thats cool. I thought about putting one on the floor but heat rises and CO2 is denser and is at ground level. Which is why they recommend putting a fan on the floor to circulate the CO2 upwards towards the leaves for the plant and to help prevent humid spots under the canopy. Cooler air sinks too.
Ill have to check out the AC Infinity tents next time I need to replace one. I like their exhaust fans and carbon filters. Very quiet.View attachment 5357083

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CO2 is slightly denser than air. Even a small circulation fan will ensure that it's a homogenous mixture throughout the tent. For the typical growing tent with proper circulation, CO2 settling on the bottom is not a concern.