VES 20" Exhaust Shutter Fan, Wall Mount, 1/3 Hp, W/9' Cord and Switch This shutter/exhaust fan can help replace your ac unit by cooling your garage, attic, greenhouse shop or chicken coop. Can easily be added to a window opening or opening in the wall along with a thermostat to optimize cooling. This VES industrial grade shutter fan can solve all of your cooling and ventilation needs. These high velocity fans act as an air conditioner to remove hot air better than a ceiling fan.