Anyone using inline carbon filters?

Greengrouch

Well-Known Member
I just have my filter outside the tent and the exhaust fan pushing through it. Probably gonna hang it inside the new 5x5 with the new led, but with a 630w de cmh in a 4x4 tent I needed that extra headroom in there.
 

iggy097

Well-Known Member
Yepper. I had to go inline cause of my short ceilings. The active air works well and is a beast! It was the only one I could find but does a good job. I had to get a 4" for a 2x4 setup also but couldnt find anything. Ended finding one designed for a septic stack and it works good as well. I'll see if I can find a link..

View attachment 5304383View attachment 5304384
How did you end up supporting that active air filter ?
 

tree beard

Well-Known Member
before you diy and learn your fans aren’t up to the task:
Not all exhaust fans will be able to push or pull through the diy idea.
That’s why there’s so much surface area in normal filters. To scrub and allow air through without too much resistance.
I was just thinking about that. Wouldnt be a bad idea to disect a spent one and measure, or weigh how much is in there, in conjuntion with its intended duct size
 

1212ham

Well-Known Member
I remember seeing an article or post about building a box around a regular carbon filter so that the intake on the filter sticks out of the box with ducting coming out of the other end of the box to exhaust the scrubbed air. Seemed like an easy diy project. A box with a hole on one side for the bottom of the filter and a hole on the other side for a duct collar.
It is easy, I used a cardboard box. One end of spiral flex duct connects to the tent, the other end screws into a hole in the side of the filter box and is secured with duck tape. The filters flange protrudes through hole in the other side of the box and connectes to the exhaust fan.

Here's a diagram from @MtRainDog

Filter box.png
 
Last edited:

Cookie Rider

Well-Known Member
It is easy, I used a cardboard box. One end of spiral flex duct connects to the tent, the other end screws into a hole in the side of the filter box and is secured with duck tape. The filters flange protrudes through hole in the other side of the box and connectes to the exhaust fan.

Here's a diagram from @MtRainDog

View attachment 5304481
Plastic garbage can works for this.
 

tree beard

Well-Known Member
Do you remember where you ordered the in-line filters from?

 

iggy097

Well-Known Member

Thanks - that was the cheapest. Just grabbed the 8 and 6". Hoping I can refill these in like 18 months or so.
 

1212ham

Well-Known Member
Thanks - that was the cheapest. Just grabbed the 8 and 6". Hoping I can refill these in like 18 months or so.
I don't see how those can work, they don't have near enough airflow capacity... septic tanks don't have fans pulling air through them.

The cylindrical inside of a common 4" x 12" long carbon filter has 150 square inches of surface area. The 4" circle of a septic filter has a surface area of 12.56 square inches.

10 CFM for fans that can move hundreds of CFM?
"The Super Wolverine can handle pressurized air flow up to 10 CFM such as when a pump turns on."
"The Wolverine Cub is an economical, residential, low flow activated carbon filter."
 

Jjgrow420

Well-Known Member
I don't see how those can work, they don't have near enough airflow capacity... septic tanks don't have fans pulling air through them.

The cylindrical inside of a common 4" x 12" long carbon filter has 150 square inches of surface area. The 4" circle of a septic filter has a surface area of 12.56 square inches.

10 CFM for fans that can move hundreds of CFM?
"The Super Wolverine can handle pressurized air flow up to 10 CFM such as when a pump turns on."
"The Wolverine Cub is an economical, residential, low flow activated carbon filter."
Yep. Better to buy something designed for the purpose you intend to use it for and not something else.
 

TCH

Well-Known Member
Just to report back - I've installed the Active Air inline filters for my 4x8 and 4x4. LOVE the extra room in the tent. Worth the cost.
On the website I see no options for fan diameter, just the length of the filters. There is a 24 and 30" option. Is one 6" and the other 8"?
 

tree beard

Well-Known Member
Update on my inline filter situation. The active air is badass and still performing flawlessly.

The 4" pvc filter for my smaller tent turned out to be a fail. My yard started smelling like a familly of skunks.. I ordered the 4" carbon filter made by kootenay that was mentioned earlier in this thread
 

tree beard

Well-Known Member
Well the kootenay 4" inline filter arrived today and there is no way in hell I can use this thing. It is literaly the size of a large dog and probably weighs over 60 lbs. I saw this ginormous box on my front porch and was like WTF, there's no way thats a filter! Lucky for me it was poorly packaged and arrived damaged, perfect excuse to send it back..

I guess I'll be looking into making my own 4" inline carbon filter out of pvc..
 
Top