The Saddle Vent was developed by Air Systems and in use around the world for over 20 years to make it easier and safer for workers to enter and exit a confined space. The Saddle Vent takes up only 3 inches in a manhole opening and functions as a fresh air conduit to the workers in the confined space. With the Saddle Vent in place, continuous ventilation is supplied to the workers by eliminating the need to remove the air duct each time a worker needs to enter or exit a confined space, increasing safety and productivity.