Cold sprays temporarily destroy the vapor blanket causing the unit to stop functioning as a vapor degreaser. Hot sprays warm the parts quickly, so they stop condensing vapor sooner. The choice is between longer and more complex cleaning cycles, or the possibility that inadequate or variable cleaning may occur. Minimize the use of sprays, and keep sprays at temperatures near the boiling point. Eliminating solvent sprays inside a degreaser will result in 30-50 percent less solvent emissions than if sprays are used.
Sprays increase emissions by inducing drafts inside the degreaser.
The spray stream itself carries air or vapor along with it. Cool or cold spray will condense vapors, thereby collapsing the vapor blanket and sucking air below the cooling coils. At a minimum, this air will carry some vapor out with it as the vapor blanket is reestablished and pushes the air out. Careless spraying can result in liquid solvent being splattered out of the degreaser entirely. Keep the spray nozzle below the cooling coils.