Topper,
I have come across this problem with the SLE5000 and Intersurgical circuits, it seems the power in the heater wire was insufficient. Changing to the heated expiratory limb circuits cured it.
I believe Intersurgical can provide prefitted sleeves but it is a long time ago so the memory might be failing me.
Another random cause of rainout was drafts, especially those caused by fans blowing on the patient.
Robert
