GrowBright 4" Inline Fan & Carbon Filter Combo

I visit my local HTG regularly and my rep there tells me that the 4in really doesnt do the job properly. He suggested a min of 6inch. I dunno, there job is to sell I know but the guy really seems to know his shit on every question I hit him with. I need to do it myself and since I'm not working right now I cant afford the 6 or 8 inch and I wont go with the 4, so I'll wait to I can get a 6.

4" won't cut the mustard my brother I have two on my shelf worthless.......6" max can 420 cfm removes all the BTU's from my 1000watter but still needed 5000BTU A.C. to run 72 degree's....4X4X7 grow space! Doesn't matter tent or wooden build........99 dollar's best spent money ever never worry set it and forget it...remember fan's only move heat they don't lower temp's!!!!!! 88 degree's out side your tent will cook you plant's....what's it worth? You can use you free time maney thing's available for free look! old lady couldn't move to window so NEVER used! got it for free....Old greenhouse being torn down....wen't and asked if I could take any stuff stashed in the shed and was told to go for it less garbage for us to throw out...cost my less than 300 dollars complete set up.... Really!1000watt HPS cool thru xxl hood 34000btu output!.jpg429 cfm exhaust thru lamp outside.jpgadded 5000 BTU A.C. COOL.jpgfound free on craig's list!!.jpgflowering 5th day!1.2m squarew 1000watt.jpg

I would say it depends on whether your going to use it for venting the room only or room and light.
I use a 4" to vent a 3x3x5 room only. It works great; almost too great at times.
If your adding a light to the flow a 6" might be a better option depending on the wattage and area to vent.


These at plantlighting should be comparable. Shipping might be your decider.
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If your concerned about noise make sure to pick up a speed controller too.
Something like a speedster is fine though they make better ones if your willing to spend more.

i have a 2x2x5.5 dr 60, i think a 6in would be over kill with exhuast. and im only going to use it to vent to room, and i have an ac in whole house and with that how i have it set up i got a 4in duct booster rted at 240w, with the fan inside the tent, with ducting leading out to vent i plan on setting it up where the carbonfilter is the onlything haning in the tent then it runs to the ducting i could either addthe boosted in the middle of the duct or just not use it at all if the 4in can pull its weight? i could understand where it might not be suffiecent if i had a huge space or something like that but i mean this is pretty small i got 2 matures going right now and a seediling outside of tent is in the low 70's, in the tent 80 80.

what if i got a 6in inline fan then a reducer from 6 to 4 then just use a 4in ducting and carbon filter?

I have two plants and it didnt cut the smell down at all. Small closet grow too. It does help keep the air cleaner and traps alot of dust though. Added some ona block linen too the mix and now there is 0 smell. Anybody who grows in apartments or small rooms should have a canister handy.

i was gonna get that also. like a 8oz of the gel and let it sit there./

might get this but idk which speed controller is good.

Hydrofarm Active Air 6 inch
In-Line Fan 400 CFM