Im offering up my experience is all. Glad to hear that.
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My room is 3.5 x 5.5 and is 100% sealed. When I go inside and close the door my ac infinity creates so much negative pressure that it feels like my fresh air vents are blowing air into my space.
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That’s fair and welcomed. Not my experience but that’s the way it goes. Always good to hear the negatives as well. Also agree with going bigger, bigger is always better with any fans.
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See that would collapse a tent. I think if you took off your filter, you’d notice some of that negative pressure dissipate. Care for an experiment?
Definitely go up 1 size if using a filter or have lots of bends or a long run
I know that seems kind of counter intuitive but it’s my experience, its a vacuum effect.
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@middiesman i would have more vents open if growing in a tent. I also have a tent with a 4in ac infinity and it also works great. That negative pressure is a good thing and can easily be reduced if need be be turning down the fan.
Sucks that you guys had issues with them. I would have definitely contacted them. Im sure they could tell you what the problem is.
I like them a lot for sure and I actually do run one on a filter in my laundry room where my cats litter box is, so I don’t want to misrepresent they can’t be used with a filter. I’ll be honest in further saying I don’t like using filters in my tents period since it creates pressure issues regardless of the fan so I’m definitely biased lol 
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I wouldn’t say I have issues with them just realistic expectations since they are inline, low voltage (low power use) devices.
I just wanted to backup the poster whose anecdote said they can struggle with filters (compared to a similarly sized but notably much more power hungry blower type).
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I have an old dayton 6" blower from about 20 yrs ago and its loud as hell and doesn’t move nearly the same amount of air. If I wanted to run 2 filters like mr.g I wouldn’t try it with my 6" fan. That would be asking way to much and would prob go with a 10"
Every time you add bends or filters you need to understand the cfm is going drop substantially so you will need more fan.
An 8" fan with 2 carbon filters will probably perform about as well as a 4" fan with no filter
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Interesting… but in general, it’s just a matter of power and the way the motor is driven. The inline fans use less power and they have better variable control because its pulse width modulated versus voltage (ultimately dictating current) modulated. The blower fans will take meat off your finger… I’m guessing you could break the drive shaft on an ac infinity sticking some meat in there but I’m not going to try it.
But we’re talking about a big difference in power use. Thats the main draw to the inline fans imo. Yeah they are weak. Thats just physics. But they are quiet and sip power for the CFMs they do generate. It’s a trade off.
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Lots of people run a filter on intake and exhaust , I’ve been doing it since 98 .one filter alone does not guarantee total odor elimination especially in high humidity conditions and I’ve ran a lot of filters over the years and a lot of fans , this was the first time I’ve ever had issues . The tent had fresh ventilation via 2 screens on the bottom of the tent plus a 6 inch tube from another room ,the door was always left open a little bit to eliminate pressure. Might work fine with one filter but when two filters are required for complete odor elimination it does not have the power to move the air thru the filters , I literally had to put my face up against the filter to feel the air moving . The fan blades are flexible plastic designed for quiet running vs moving air . I like the fans and if moving air through a loose filter just to control temps it might be fine it might last forever , but one thing I am absolutely sure about is if running two quality tight carbon filters for the sole purpose of eliminating odor … they suck . No reason for anybody else to waste money on this fan or this style of fan if running the same set up as I was and many do and not sure why it bothers u ? I did contact infinity they tried to tell me I needed their filters , anybody that’s been around long enough knows that when humidity goes up the carbon absorbs the water and does not work as good and smells start lurking around the house with loose free flowing filters. My guess is they wanted to sell me loose filters to compensate for weak fans and everyone knows loose filters are junk . Not sure why good info has u so triggered , sometimes it’s better to listen and maybe learn vs attacking .
@MrG … 1 im not attacking you…2 in my defense im a little high atm and when you said you were running an intake and exhaust filters my stoner brain was thinking the passive room intakes lol.
After the fact I realized what you were saying. I stick by my defense of ac infinity products and service. You simply won’t find many complaints similar to yours here.
Imo the problem is your asking the fan to do more than what is made to do. Had you purchased a larger fan that would support 2 filters im guessing you wouldn’t have had that issue. There is plenty of info out there telling you the drop in cfm per filter.
Back in the day I used to make my own carbon filters and they were very tight. Well thats a problem because you are severely reducing the air flow so yes you will need a much larger fan than you are expecting.
I think you are definitely taking what im saying the wrong way. I want EVERYONE to succeed when growing their own meds including you. Improper sizing seems like your issue and not the product itself. Just my opinion 🤷 but hey you do you.
Happy growing , hope you get things figured out.
@MrG is it possible for you to vent outside and just use 1 filter? I’m assuming your venting back into your house?
It’s all good I just replaced the bearings on my old loud energy sucking 4 inch fan and all was good . When this happened I was living in a apartment building . I knew in the back of my mind this style of fan might not work , then it locked up , then I found out all I needed was a $ 12 bearing to fix my old fan . I tried fixing the plastic infinity was not happening, so my experience was exhausting
I exhaust to the outside and have grown a few strains that give off smells the last few weeks of flowers so I can relate to smell control. I currently have a couple plants going now that stink to high hell 6 week in veg so im guessing its going to get much worse in late flower.
I have an old carbon filters that I thought about adding on the exhaust but fear its going to cut down my cfm to much in the summer. Winter time I’m sure I could pull it off but yet to be seen.
My room is pretty dialed in so I’d rather not screw with it but I may have to do something as I live in a residential neighborhood. Either that or just get a taxidermist to make me some skunks to set up in my yard 
You should be able to overcome the restriction by adding more surface area. For example, Y 2 carbon filters together so they’re fed in parallel versus series.
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Never thought of that, might have to look for an adapter. I have 2 or 3 filters that were only used for a couple grows. Thats definitely the downside to the looser packed filters. After 2 grows I replace them because they are less effective.
I had a situation in the past were I was running the exhaust out the roof using a old furnace duct with one filter, the house smelled clean and fresh . I noticed one of my neighbors walking around one day, then again a few days later , then it finally clicked he was walking down wind of my house , I went outside to talk , then I smelled the weed . I went in the house and could not smell anything. So from that point I eliminated the exterior ducting and just went back to two filters circulating in the room so I could keep track of the days it got smelly before the neighbors got a whiff , I went back over and talked to him , he basically said I dont want to smell it anymore and he didn’t after that .
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