I have 2 windows in my 30x36 garage,
one on west wall, which stands only 10 feet from my house and one on the north wall, at one time I had fans in both, have a fan in neither right now/ as I took them down so I could finish insulating and OSB sheating the walls. gonna leave them out for the winter.
The fan in the north wall I took down a couple years ago, the one on the west side had been in there for about 8 years and is a reversible one so I can swap flow direction depending on whether I want fresh air in or to vent fumes out.
As I was doing the insulation and sheating, I was noticing how weathered and deteriorated the bottom 2X4 (part of the wall framing for window opening) is getting.
Not yet "rotten" by any means, but definitely gray and you can tell it has been wet a bunch. I'm definitely gonna have to paint those and seal them up good so they don't deteriorate any farther. I tend to leave these windows open most of the time it is "T shirt weather" and only close them for winter.
I have a 3rd window opening framed out also on the north wall (my overhead doors are on the south end) but I cut what was left of this 3rd window frame, with my Sawzall and covered the hole with OSB, because of an in-shop "oops" that broke the glass.
When I built the garage I went with a cheaper single hung vinyl framed window being "just a garage" looking back and seeing that the glass could not very well be replaced separately (hence the complete removal, and replacement by the single piece of OSB) I wish now that I had bought better windows if only so I would not have to replace the whole unit just to replace the glass should it ever be needed again in the future.
I have a replacement double hung window here for that opening, just have not gotten around to popping it in. I found a deal on a closeout (mis ordered for another customer) on this double hung, a lot more expensive window, but I got it cheaper than I paid originally for the "cheap" windows that I originally put in there when I built it.
The east wall is solid, no doors/windows as I wasn't getting along with the neighbors over there when I built the garage so I figured that they didn't need to see anything I may be doing out there....
But with the 1 window and man-door on the west wall and even currently the 1 window on the north wall, ventilation seems plenty when working out there with the overhead doors shut. As things are now the windows are in diagonal opposite corners. I can turn on the reversible fan and open that other window and have plenty of ventilation. When I get that other window put back in the hole it will be that much better once again.
Look at garage sales, auctions etc for old school fans, mine have adjustable sliders and mount right to the garage framing over the windows. I got mine for no more than a couple of bucks a piece and still going strong after several years. one looks like 50s/60s the other one looks like it was probably made in the 70s, not the cheap Chinese junk the stores all have today.
I have a 3rd one of these laying in the attic that will go up over that 3rd window once I get around to replacing it.
