Question about carbon filter install OUTSIDE of tent?!

S

Smokenpassout

Well-Known Member
I have always gone with the standard carbon filter setup at the top inside of the tent. This time I’m vegging an additional month, and going to do icarbon filter outside of tent, to give me extra height for the LED light. Are carbon filters any less smell effective in this new orientation? The videos I have seen instruct to place the prefilter on the inside of cabon canister and run ducting straight up and through top of tent. My main concern is I’m very particular about smell. I usually run a recycled older filter even in Veg when things start to get a little musky, and then switch to a new fresh cabon filter in flower. Even then they are about 90-95% accurate it seems. I still have a little sweetness in the air during weeks 6-10…..and have a plugin inside the lung room, and an ona gel.
 
All of mine run on top of tent to make way for boxfans and no issues. It can clog faster but like one said I get the vivosun ones they arent too expensive. I done 3 grows like that so far so good.
 
Pretty sure you can add a prefilter still im not sure how. Id imagine on the duct port somewhere maybe a special flange. A coarse filter as I want maximum airflow to maintain rh. I been meaning to put a pollen grade filter around the carbon part to run new strains so if they herm the pollen wont spread.

I read pollen drift is mostly from opening tents tho.
 
Construct a box to place on outside of tent largest enough to hold filter with fittings the size of your ducts. Draw air from tent into box. Exhaust air from box by drawing through the filter and outside the box to the vent fan. The box, filter, and vent fan are all outside of tent. Basically the box becomes becomes a secondary chamber of the tent.
 
If you have your carbon filter outside the tent: use minimal length ducting between tent and filter and be extra careful about it being air tight. The benefit of having the carbon filter inside is that any air passing into ducting automatically needs to pass the filter. With it outside any air escaping the ducting between tent and filter will be unfiltered and smelly.
 
Here are some pics of the external filter box I built and had on my old tent that I could never get my lights up high enough. Intake is on the bottom and sat on top of tent right into tent port so no duct there at all. Box and pvc fittings all sealed with silicone caulk. Access panel has rubber gasket all around for air tight seal and secured when closed with 2 screws. External duct went to duct fan and then outside my house. I used AC Infinity's double layered duct and never had any odor inside or outside of my house. No longer used since buying a Gorilla 4 x 8 tent with 8 foot ceiling.

Filter box.jpgFilter box2.jpgFilter box3.jpg
 
Update, well I have it all set up and there’s a few issues. One, humidity, I noticed it has bounced up to 80%. my humidity was running 65% which is normal for me before I start to flower. Temp is a steady 75 which I am good with. Filter seems super quiet cranked up to 80%? Not feeling air blowing much from filter although I can feel sucking of air in from inside. Maybe clogged?
 
Update installed outside tent. On the negative my normal 65% humidity has rocketed up to 80%. Plants are newly saturated, yet humidity is way up. Temp has leveled out at 75 which I’m good with. I have bumped the fan speed up to 80% from 60% and barely feel air coming out of filter, although I can feel air sucking in from tent. To be honest it may be that a 4” is barely adequate for a 3X3 space. Only improvement I can think of is to get filter and fan higher up reducing the 4ft or so duct run to filter.
 
You wont feel much coming out of it its normal. 4” a bit small, I use 6” for 3x3, all screens cut out with vents open. Even the low hanging duct ports I roll open. Exaust on max 6” S line ac infinity not the A line which has slightly less cfm.
 
marzig said:
Here are some pics of the external filter box I built and had on my old tent that I could never get my lights up high enough. Intake is on the bottom and sat on top of tent right into tent port so no duct there at all. Box and pvc fittings all sealed with silicone caulk. Access panel has rubber gasket all around for air tight seal and secured when closed with 2 screws. External duct went to duct fan and then outside my house. I used AC Infinity's double layered duct and never had any odor inside or outside of my house. No longer used since buying a Gorilla 4 x 8 tent with 8 foot ceiling.

View attachment 5469231View attachment 5469232View attachment 5469233
Click to expand...
I do the same but add dryer sheets to the box, then the exhaust end goes into an air purifier (cheap winix ) . Basically smells like your doing laundry all the time. I’m using a thick cardboard box currently but after seeing your I’m definitely doing an upgrade project. Thx for posting :joint:
 
medidedicated said:
You wont feel much coming out of it its normal. 4” a bit small, I use 6” for 3x3, all screens cut out with vents open. Even the low hanging duct ports I roll open. Exaust on max 6” S line ac infinity not the A line which has slightly less cfm.
Click to expand...
Thanks for the tip about S Line. Definitley getting a 6” soon. Question about intake ports. I have an AC Infinity tent and have all three screened ports open. Is that enough airflow. Every other port I have double cinched tight for paranoia of leaking smellls, as well as critters coming in.
 
Smokenpassout said:
Thanks for the tip about S Line. Definitley getting a 6” soon. Question about intake ports. I have an AC Infinity tent and have all three screened ports open. Is that enough airflow. Every other port I have double cinched tight for paranoia of leaking smellls, as well as critters coming in.
Click to expand...

Thats what I meant, I literally cut the bug screen off the intake vents. Cuz they just clog with dust every week and restrict airflow and the ones facing the back of tent is a B to get to so I cut it out. I leave the veg tent ones for bugs its ok there.

My plants that go to flower room are bagged up impossible for bugs to get into so no worries. I only worry about spider mites and thrips etc those kinds thats why my veg tent I leave screen on.

The bottom duct ports you have closed, I rolled those all open for extra airflow. The fans move a ton of air so its still negative air pressure it just allows slightly more air movement. That in turn lowers humidity some.
 

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