You are correct! I've been painting without one and it stinks up the house. Living in wonderful mn the weather stops you from painting outside for almost 9 months. I had to build one with all these fun runs coming up needing bodies painted :)
Now let me warn you this thing is UGLY!!! But it works and I was going for paint booth on a budget.
Bath fan $13 buck
Cord for bath fan $6
Light and bulbs $10
Roll of duct tape $5
Exhaust pipe $3
Cardboard boxes $0 ya baby
Total $37to build a paint booth. Pretty good in my book
Now here the beast is lol
I took the hinges off the window and installed them on a piece of plywood cut to size


Putting primer on my sportsman cuda body..... Just had to test it out :)

Added curtains to keep the heat in
