The Portable Timed/Delay 20 Gallon 305 4-Way Fogger is a chemical atomizer that uses compressed air (29.5 CFM @ 80 PSI) and venturi action to draw ready-to-use chemical solution from the tank on the all stainless steel cart. It atomizes the solution and projects it as light, "damp" fog particles in 4 directions up to 25 feet. This unit features a telescoping mast and can also be used as a 2-Way fogger. An adjustable delay timer (up to 6 hours) allows the unit to be set to fog at a later time, and an adjustable run timer controls the length of time the unit will be fogging (up to 60 minutes).