Abstract: A fog generator comprising a pump which delivers under hitch pressure a volatilizable chemical into a centrifuge-heater component which centrifuges and heats the chemical efficiently. The centrifuge forces heavier particles of the volatilizable chemical against highly heated areas of the centrifuge member to provide added pressure to the volatilizable chemical passing through the centrifuge resulting in increased production of ultra-fine fog. One embodiment describes a fog generator which includes an ice chamber through which some of the volatilized chemical may be directed to cool the volatilized chemical passing through ice particles therein and make more effective the production of low-lying fog. To make the use of the ice chamber even more efficient, the ice chamber includes means for efficient removal of water which has accumulated from melted ice.