Here’s a little joint project between @Gibbtall and I…
As you may know, we have two box fans in the back window, pointed in opposing directions. They are labeled so you can either bring air in from the alley, or exhaust air out. Many people don’t realize this and run them both simultaneously which defeats their purpose.
Now we have a switch.
Leave them plugged in please. Use the switch to choose the intake or the exhaust. And turn them off before you leave.
For best laser fume management, use exhaust. You can also open the front door and run fans to pull clean air in from the hallway.