4in fan and phresh filter enough?

The filter is fine, but the fan is not. If you are planning to use a passive intake, I would use a single 4 inch intake coming from outside, (it doesn't matter the length, it's not included in the cfm formula I use), and place it near one of your corners at the bottom of your tent. Then get one of those flat window fans and place it on the same wall as that intake, above it, at the sweet spot of your plants vertical growth, center the fan @ 36 inches. So it grabs hold of the air coming into your tent and blows it through your plants. Then on the opposite end of your tent near the top of the tent place you cf there and use a small 2 foot piece of ducting to exhaust your cf out of your tent, then at the end of that, outside your tent, use a 4 inch to 6 inch ducting reducer, and hook the cf 4 inch ducting to one end of the reducer, and then hook a 6 inch ducting to the other end, and then when that 6 inch ducting has enough to reach the floor with a L bend, (5 feet), at the end hook a 6 inch 260 cfm fan there, and then run another 6 inch ducting from the back end of that fan to the outside, (doesn't matter the length, it's not included in the cfm formula I use). That will give you a even 164 cfm passive system with the cotton prefilter on your cf, which will bring in plenty of fresh air, while also allowing your cf to filter your exhaust at the optimum rate for a 3 X 2 x 5 grow tent. Your tent is really a touch smaller than that, so your passive system only needs to be 156 cfm, but it's kind of senseless to run a variable fan controller to slow down your 6 inch inline exhaust fan by 16cfm / 2. Also use something like Pellon 807 wonder web with a rubber band to filter your intake and exhaust ducting to keep bugs and contaminates out of your grow room. It works great as a filter without restricting any airflow. Run a vacuum hose over the filter once a month to remove dust and other contaminates from the filter.

 

You're running what, 280-300 actual wattage between the two lights, or somewhere in that neighborhood? I'd expect around 10f above intake temps with the 4" fan/filter. So if the room around your tent is 70f, your canopy temps should be around 80f, give or take.

Cutting it pretty close, imo. I'd get a 6" fan/filter with a speed controller for summer temps.

 

Nt can I ask where you ordered from? The only reason I ask is? Cause I have an.
Apollo tent 36x20x62 about the same size as yours.($66)
Marshydro 600 watt LED($130)
An in-line Carbon filter with speed control 200 cfm($120)
V-Teck booster fan 100 cfm($20)
Comfort zone 4 inch clip on fan($12)
4x25 non-insulated ducking($13)
2 pairs of trimmers($9)
I'm sure you probably have more then what I have! I still need my medium, smart pots and seeds! Good Luck with your Grow



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Yes I still have odds and ends I still have to buy! I still have to set my tent up lights everything really lol. Can't wait!!! I have a grow box going now using 3/26 watt Cfl's. 2 plants using Aurora autoflower from Nirvana.com for $35 I got 5 Aurora and 10 Freebies which are big beans compared to the autos. My younger plant I transplanted which was a bad idea cause you don't transplant Autos. To much stress!!! It had a Nitrogen toxicity, so I flushed it 2 days ago already she's looking better! Anyway Have Fun and Good Luck with your Grow


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Here's pics!


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can you put a picture of your tent so I can see where ALL your ducts/vents are. Then I will draw you a diagram....

 

Hi

I included 3 quick diagrams, the only thing that must match is the 4 inch coming out of the CF exiting your tent. That 4 inch duct / vent must be 3 feet long going into the 4 to 6 inch reducer, that will give you the correct air flow to vent your tent and provide optimized carbon filtering....

 

If you want to use a higher fan that just fine, but you will need to use a speed controller then because my diagram, and vent sizing 4 to 6 inch after 3 feet sets a 6 inch 260cfm fan to intake and exhaust at the sweet pot, where you will have plenty enough intake air coming in while also allowing your CF to filter the exhaust at the rate it will best filter all the smelly smells coming out of your tent! The 4 inch coming out of your CF and going out of your tent @ 3 feet then being connected to a 6 inch vent via 4 inch to 6 inch vent reducer is used to set the correct air flow for your whole system to 158 cfm to 164 cfm for your setup. I think that should answer your question. Yes, the picture showing the CF is the front view of the other picture showing rear view of that same wall. I didn't include the rear view for the 4 inch intake because it doesn't have any sizing changes, it's 4 inches coming from outside or somewhere in the same room your grow tent is in. But it must have a duct / vent that contains at least (2) 45% or a s curve so no light can leak in during the dark period. Also be sure to place a filter on that intake so no bugs get into your grow tent..... As for the fan, just a cheap 25 dollar fan will work, get one that has aluminum blades, it will be much quieter than a plastic or steel one. This is the inline fan I use for all my 4 x 4 or smaller grow tents.