My question was can I pull hot stale air through a 4 inch ven tech variable control fan , and use the San fan to circulate the air back in the tent since it’s a small 2x2x5 tent . Now I purchased 2 fans , the inline model and the duct model . Should I just circulate the ven tech duct model ( the cheap one for $25 )to bring cool air in the tent maybe from the bottom vent hole , and used the better made model that like $70 to pulled the stale hot air out through carbon filter . I was thinking of budget cutting and just use the one expensive fan to pull and blow back in the same tent , pull from top through filter and blow back in through bottom . Was unsure if that would work . Besides waiting on an answer I just purchased the 2 waiting for them to be delivered , alone with my (Plant Protector) from ILGM , I message Claire and was told to give it another week . Recieved seeds and booster but not protector . But I’m thinking with such a small space grow tent and a very powerful advance light led it’s getting high temps and stale air is causing the plants to not vigor I think . Must get fresh air moving . Than my other question is , would a flat beer or sprite soda be supplemented for co2 to the plants , tried the green pads , didn’t see no change in 4 weeks or so and used 2 at a time , 4 days apart . Was thinking of trying the yeast and sugar generator in the bottle method and tubing but again seen where a guy used a flat beer and it supposedly worked , not 100% on that , many sceptic so out here trying to master you guys growing experience for monetary gains , I’m just trying to keep a good stash of quality medicine for my medical issues , because driving to Colorado is expensive and very risky with the troopers , do need that with my line of business and profession . Since I started on this mission , I’m in to it like $2500 and have yet to reach a harvest . I been fighting and brainstorming trying to save this bag seed plant that survived the stress and hell I put it through , the other 2 didn’t make it . So I bought seeds from ILGM 10 ww 10 ogkush and plan on ak47 and silver haze here in a few weeks , trying not to have to many packages deliver to often , but my question was mainly on getting the air moving in and out the tent …sorry for the long paragraph , hopefully you stoned and understand . My plane is to try the sea of green methods , but I’m guessing I’m gone need another tent to keep a mother plant if I can get one to grow properly .