fresh air intake question

I have a 3x3 grow tent that sits next to a window inside a bedroom. I've got a air cooled yield master hood and the hot air is exhausted out of the tent by a 6" vortex which goes outside through the window. Right now it's summer, so I have been intaking air from my air conditioning system through ducting which leads into a ducting port in the tent. The heat will be gone in a couple months and I will need have no need to run my a/c when I can just cool the tent with air from outside.

My question is, what would be the best fan to intake air from outside and put it into the tent. From my understanding an inline fan is not necessary. So then I would be looking at either a blower/squirrel cage fan or an axial fan. Which one would be best? And then what would be the best way to install it? have the fan at the window and have ducting leading into the bottom of the tent or have ducting at the window connecting to a fan that sits in a port at the bottom of the tent?

Right now my plan is to get a piece of wood, cut two holes in it. one hole on the bottom for the intake and the other on top for exhaust. have ducting run from the intake hole to an axial fan that sits in a port of the tent. good or no good?

thanks for any help or responses

Negative air pressure. A passive duct.

If you have air being sucked out through a carbon filter, and have a passive duct on your tent, that will create negative air pressure and bring fresh air into the tent.

smokebros said:

Negative air pressure. A passive duct.

If you have air being sucked out through a carbon filter, and have a passive duct on your tent, that will create negative air pressure and bring fresh air into the tent.

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Yeah, I do have the air being sucked through a carbon filter, through ducting to the hood, through ducting to the inline fan that than goes out the window. so ur saying I do not need a fan to bring in the air b/c the negative pressure will do the job, so all I need is some ducting from the window to the tent and im all good?

negative pressure will pull fresh air in, yes. I prefer to maintain a negative pressure at all times but I also have fans pushing air in. I had to play with the setup to get it dialed in. i like it because the fan pulling out, through carbon, doesnt have to work quite as hard.