6" Inline Duct FanWhy I like this: This is the ventilation fan I use in my paint booth. I do need to inform you that this will require a 6" outlet in your booth, but it will fit in a Paasche paint booth if you increase the diameter of the fan outlet. You can also pair it with a homemade paint booth if you have constructed one on your own. This fan is great because with the standard 4" outlet and a 4" fan, you will likely not achieve adequate ventilation for your