ArcticVent is the only certified solution to freeze protect plumbing vent stacks. Prolonged cold temperatures cause plumbing vent stacks to ice up and form a blockage as warm moist air rises, condenses and freezes. ArcticVent eliminates this ice blockage where it exits on the roof of a building, promoting healthier living conditions. ArcticVent can be used in new installations or to retro-fit existing non-protected (standard) 3 inch and larger vent stacks.