The sucking in is negative pressure. Its drawing the air in the tent in quicker than its port allows. It will stretch on the tent walls and threads over time. Cheap made tents or old ones will begin to come apart. I get mine to where it starts to pull in then back off. I have 2 tents both with an intake only. Draw fresh air into bottom port then i have the fan just sitting vertical in the top port. I pull heat from lights to exhaust immediately. I have heat issues so I run lights at night, exhaust the heat and pull in fresh air. Of course im pulling in humidity too so i have to run a dehumidifier.
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The 8 inch vivosun outline fan has a carbon filter, which is well needed lol but like I said when we had a 8 Inch inline to match it and it was puffing out badly, then when I introduced the 6 inch inline fan on the slowest mode , it quit puffing out and is barely sucking in at all, hardly noticable do you think that’s fine?
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I think it should be okay the way you have described it. Sounds like you got it to balance out.
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