Also called Cone Top Vents or Shanty Caps, these chimney caps may be used as an all weather cap to prevent snow and rain from entering your chimney pipe. Applications for these chimney caps include fossil fuel chimneys, air exhaust vents for fans and passive ventilation. Available with or without spark arresting screen. The sizes below our designed to fit on the outside diameter of your chimney pipe and are secured by a draw bolt that is included. If installing in double or triple wall pipe see adapters HERE