Check the Post in Cabinet/Closet growing, Or Growroom setups.. There is a bunch of info on that. If not there look up intalling a dryer vent on the internet. Its the same ideas. I hole to push air out with a fan. and another hole to suk air in.

the hole that susk air in should be the same size or slighty bigger than the outtake hole

Hope some of this sticks...

kd_special