“Central” carbon filtration setup for lung room and tents

I upgraded my filter, and need to make my filtration setup more efficient. I was running a 6” kootenay filter hooked up to an old 6” eco line fan (440 cfm) to scrub my flower tent, and then having that exit the tent and run through my old/used carbon filter. The issue is, we have central air and my “lung room” is open. Any remaining smell gets picked up and blown throughout the house. I caved and bought a 12”x40” Can Fan Filter, paired with this fan :


My state is now legal and will allow more plants than I need, but I still value my privacy. I currently have 2 5x5 tents next to each other, with 6” vent holes. I’d like to run 2 - 6” “duct splitters”. One would mount above the tents, with ducting to suck/filter air from each tent - and then through the central fan and carbon filter. Another “t shaped duct splitter” would branch off with 2 additional lines, sucking up and filtering ambient air from 2 different ends of the room. I’m going to construct simple pre-filters to screen out any dust for each of these lines (as advised from can fan site when “blowing through the filter”). The idea is that I over purchased for my needs, so I might as well try and use it to its max potential.


I’m concerned with the possible back pressure on the fan with my intended setup, and overall load on the fan. The fan certainly has the power to do it, but I’m worried about the possible resistance from the length of ducting. Even though the tent holes are 6”, should I consider running 8” flexible ducting instead, and running it to a 6” reducer, to fit the tents? Other options would be: Turn down the fan speed (I have a fan speed controller), and/or put “relief holes” in the ducting to bring in more air and relieve pressure on the system.

Pics of: tents, fan, and some hardware store goodies - 12”-8” reducer, 12” connector flange for fan/reducer, connector flange for 6-8” reducer, 2 duct splitter pieces, ducting, hose clamps, strapping for mounting all ducting.

Thank you.

I have two 4ft² tents in a lung room and i have one 250mm inline silenced extraction fan .
Carbon filter in lung room to inline fan to Y piece to 12v shutters on each bit of the Y, if one tent calls for fan that tents shutter opens and fan runs at 50% if second tent calls for fan second shutter opens and it ramps up to 100% regardless of the order they call for fan .
You can see the purple shutters in first picture

I cannot edit my old post, so here goes : DO NOT COPY THIS IDEA! I fucking fried this stupidly expensive fan and the filter is worthless now and taking up a whole shelf on my basement. I used the wrong dimmer type device (recommended by the grow shop and the can fan website) and literally melted it, nearly causing a fire. Then I got the fan warrantied and replaced, after speaking with a rep for a long time via email about their poor recommendation. I re-did the ducting with larger diameter ducts, and added their expensive cann-troller variac resistor as newly recommended.

Turns out, this fan is so damn strong, that it needs to run at full speed to move enough air to be able to cool itself off, or itl overheat. This was learned after the “experiment” concluded, and after a ton of extra research. I tried larger ducts, running it at about 70%, and made relief holes in the duct work to relieve pressure, but it didn’t matter.

Industrial equipment is made for industry use, not home-use. Don’t make this expensive mistake unless you are a professional HVAC person. 1700 CFM has no business inside a home. You can’t turn a lion into a housecat.

I have not grown out that special cut that made me go down this whole rabbit hole of scent control. It’s been kept as a mom, waiting to be flowered out again.

MissinThe90’sStrains said:

I cannot edit my old post, so here goes : DO NOT COPY THIS IDEA! I fucking fried this stupidly expensive fan and the filter is worthless now and taking up a whole shelf on my basement. I used the wrong dimmer type device (recommended by the grow shop and the can fan website) and literally melted it, nearly causing a fire. Then I got the fan warrantied and replaced, after speaking with a rep for a long time via email about their poor recommendation. I re-did the ducting with larger diameter ducts, and added their expensive cann-troller variac resistor as newly recommended.

Turns out, this fan is so damn strong, that it needs to run at full speed to move enough air to be able to cool itself off, or itl overheat. This was learned after the “experiment” concluded, and after a ton of extra research. I tried larger ducts, running it at about 70%, and made relief holes in the duct work to relieve pressure, but it didn’t matter.

Industrial equipment is made for industry use, not home-use. Don’t make this expensive mistake unless you are a professional HVAC person. 1700 CFM has no business inside a home. You can’t turn a lion into a housecat.

I have not grown out that special cut that made me go down this whole rabbit hole of scent control. It’s been kept as a mom, waiting to be flowered out again.

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The fan i have was a 2 speed fan from factory so i knew it didnt have a problem running at 50% ,im an electrician by trade so i made sure to use an appropriate speed controller and i even took a current reading to make sure the amperage was within spec .
I didnt realise this thread was so old until i commented
Not sure how it was in the new comments section
Shame you had problems your fan .
Hope all is well now.