Swivel aluminum base, diameter 300mm KJ39/300

Rotary chimney cowls used for ventilation chimneys. Spherical and longitudinal rotary caps are produced in the ranges of diameters of the inlet pipes of ventilation ducts DN 150 - 300 mm. The bases can be made of aluminum sheet or acid-resistant sheet. They support the chimney draft by creating negative pressure in the ventilation duct and prevent back draft. The second purpose of using the attachments is to protect the chimney ventilation duct against precipitation.