I truly think there should be a solid thread for people (notice I dont say only virgin growers) who dont have an efficient ventilation system. I personally just started growing, its a big step to cut holes through your walls and if doing so, one should be confident in their planning.
Also, if one has a large room should they grow in the corner, or make an enclosed area possibly in the corner?
With my ventilation, Idk if i should suck or blow the air..i wanted to possibly have a filter and inline fan in another room, push or pull the air into my grow room and thru my cool tube, not sure what to do after that. My other question is, do i need anymore ventilation as I have a warm air intake right next to my reflector on the ceiling not sure if i could use that somehow?
Cutting holes in your wall is very easy to do. Get a drywall hand saw at HD (they're inexpensive). It'll have a sharp point. Put the sharp point on a spot where you want to start cutting and use the palm of your hand to get the blade into the drywall. They you just cut. After you put whatever it is in the hole, use some caulk with a caulking gun to create a seam around the edge to blend it to the wall so you don't have any gaps showing. Save the cutout piece in case you want reverse it later. Then it's as simple as using a board for a backplate and screwing the old piece back in place. Then caulk it and maybe use a little spray texture to conceal the cut.
These kinds of instructions can easily be found on home improvement forums
Doesn't make much difference if you push or pull the air. Some people say putting the fan post-light will heat up the fan, but it probably doesn't make much difference.
Don't get one of those home depot booster fans. They're crap and will not cool properly. Look on amazon for inline fans from can fan, hurricane, etc. Just search for 6" inline fans and you'll see them. You will also see fan/filter combos. Those are usually a good deal. Consider getting a fan controller because you may not need to run it on full all or even part of the time. You can get them for $20 on amazon. When these fans are at their max they can get loud. You can also get a fan muffler that will help a lot with the noise.
If you use the corner of the room to start then you already have two of your walls built. Less building = less cost and work. Having it enclosed can get more light to the outside plants because you can use mylar to reflect light back onto the plants. There are benefits and downsides to each but I would go with an enclosure rather than the whole room unless you are planning on using the whole room to grow.
Try to get your intake as low as possible. Warm air rises. Even if you use some duct tubing to extend the intake to ground level it will help.
Hope that helps