ventilation issue

Hey everybody,

So I've got a ventilation issue. I've got two chambers, one is 4x4 by 7'ish

The other is like 2x2 by 4' ish.

The small one is the veg chamber
The big one is the flowering chamber

Both chambers are equipped with a 6" duct booster fan.





* Its been getting hot in my room, the ballast is outside of the chamber, so this might add heat to the room. Additionally, the smaller chamber has a small 2' 4lamp t5 in it. This isn't venting to the outside. I notice my exhaust from the big chamber is hardly blowing at all, but some.*


Now, what I'm wondering is can I connect the exhaust from the veg chamber through a port in the flowering chamber,

Would this create unequal pressures in the chamber? * I've never hooked up 2 duct boosters in a row, how far should they be spaced?*

*should I mount the ballast in the flowering chamber?

Again wondering about blowing air out of the small tent into the big one, where it will be sucked from the cooltube

So basically I got a little box, a big box, two ductol booster fans -- and a ballast.

How should I do it?

If anything how far should the duct boosters be separated?

Your pictures are actually scary. Ghost movie type stuff.


The 6" duct booster fans run about ~130cfm each. A 6" inline blower moves 400-430 cfm. Upgrade the system to an inline blower. You can use the booster fans at the intakes of the grow spaces.

You will need an inline fan anyway for the carbon filter. Use a 4 in inline and filter for the 4x4 and set a 6 in booster on top of the 2x2 over the celing vent. That will be enough to properly vent the t5..... Note the room the tents are in will need acess to ac. Venting tent heat into a room raises thats room ambient temp which makes the air exchange less effective in terms of managing heat

Bump, people know about required cfm and duct booster vans viability. How can I do it? How should I space them? Think I could figure it out?

No point getting a stronger fan only to crank it down.

cfm means dick with a booster fan on a filter the motors arnt strong enough to pull through a filter effectively. that's like tiring to fill an air bottle with an aquarium air pump. it might move a ton of air but is only rated for 5 psi. I run a hydro store. show me a link where a booster fan working a carbon filter and I will save lots of people a lot of money. Honestly I have doubts abought your source being reliable. if this were something that was " already known" than wouldn't commercial grows do that. after all commercial operations are all abought the bottom line. you would think if there were a cheaper way they would be doing it.

Greggl4321 said:

Bump, people know about required cfm and duct booster vans viability. How can I do it? How should I space them? Think I could figure it out?

No point getting a stronger fan only to crank it down.

Click to expand...

Those tiny fans aren't going to do shit for you or your plants. Honestly they'll end up burning up especially if they're connected to a carbon filter. The motors just aren't designed for the application your using them for.

You need a proper turbine fan to move air. Duct fans are only used in low pressure ducts to keep air flowing in a certain direction. If you have heat issues, you will need a bigger a/c. No way around it. I live in FL so I know the pain but if your room is small enough which it looks like it is, you may only need a 10K BTU a/c. My 2x2x4 ft tent with a 600W LED heats up my 8x12 ft room quite a bit and a 5K BTU a/c wouldn't cut it in the summer.

You don't need a super expensive brand either. With proper maintenance, my cheapo Walmart-bought Haier 12K BTU a/c has been working for 5 years and still works perfect.

I'm considering adding an additional duct fan. I should of went with the harbor freight blow mod. Had one before with some sort of ducting rivited to the housing. That was very silent, practicaly no sound, and it moved a lot of air.

Not too sure how easily the lasko fan could be nodded, the pictorial I saw looked complex.

The duct blower fan meets the cfm requirements, hence my question.


No carbon sock.

Harbor freight blow mod?

No

Greggl4321 said:

I'm considering adding an additional duct fan. I should of went with the harbor freight blow mod. Had one before with some sort of ducting rivited to the housing. That was very silent, practicaly no sound, and it moved a lot of air.

Not too sure how easily the lasko fan could be nodded, the pictorial I saw looked complex.

The duct blower fan meets the cfm requirements, hence my question.


No carbon sock.

Click to expand...

What is a harbor freight blow mod?

There was a m

From experience...don't waste your time with another duct fan. You will need a 6 inch inline fan. Get a round tee and vent both tents with 1 fan.