Our chimneys are made of durable formed poly. The chimney sections fit together easily for ease of installation. Releasing exhaust from the peak of the roof. This system is perfect for buildings where adding side vents is impractical because of existing concrete construction materials or when buildings are constructed too close for adequate side vent systems. Chimney ventilation is recommended for all types of livestock environments. Swine: finishing and gestation. Diary: dry cow, maturity and freestall. Beef: feeder, finishing Cow/calf and Sheep: lambing and finishing and additional deep-bedded applications.