With no moving parts the vortex tube spins filtered compressed cold air by forcing the compressed air through a generation chamber which spins the air centrifugally along the inner walls at a high rate of speed toward the control valve producing cold airstreams.Features. Provides continuous cool or warm air delivery. Easy temperature adjustment even with gloved hands. No moving parts exceptionally reliable. Control valve allows for temperature adjustment. Will cool or warm compressed air 25 degrees. Material - Plastic