Somehow water vapor is a large enough constituent of crankcase aerosol to be of some concern in cold weather, or so the engineer at Racor explained today. Much of what he said went over my head... but here is what I understand so far:
If operating in very cold conditions, the water vapor in the oil mist can, layer by layer, condense into an icy sludge that can eventually constrict the ventilation tube. An ice dam, if you will.
Racor sells wrap around heater kits for their CCV4500 in part due to the engine fan sucking in and blowing frigid air into the engine compartment.
So many things to think about when making modifications. What works for a vendor based in Florida or Texas may not work so well for a customer in North Dakota or Saskatchwan.
Never mind me, I'm just resurrecting old threads from the dead in my scorched earth search for CCV filtration solutions!