Rotating chimney cowl with ball bearings Ø150, acid-resistant steel (inox)

Chimney and gravity ventilation duct termination

The rotating chimney cowl Ø150 is intended for finishing gravity ventilation ducts and chimneys. As the dome rotates, the wind creates negative pressure in the duct, and the pressure difference helps extract air from the building.

Main advantages

• Acid-resistant stainless steel: the cowl is made of stainless steel 1.4404.
• Ball bearings in oil: the rotor rotates quietly, for a long time and reliably.
• Operation regardless of wind direction: the dome turns automatically according to the wind direction.
• Improved draft: suitable for weak or no draft, a too short chimney, or turbulence.
• Duct protection: helps protect the duct from precipitation and draft disturbances.

Use and installation

The cowl is used on gravity ventilation ducts and chimneys where a termination with protection against precipitation and assistance with draft is required. It is recommended for houses among trees or in a valley, and when the chimney is lower than the roof ridge.

The nominal diameter is 150 mm, and the inner diameter of the sleeve is 152.5 mm. The cowl can be installed directly on the duct with the sleeve or on a base. A version with a base is also available, with a square mounting plate 265 mm and a ring 90 mm high, and it is attached to the chimney top with 4 screws. It is not suitable for chimneys in which coal is burned, including pea coal.

Frequently asked questions

How does the rotating chimney cowl help with ventilation?

The wind turns the dome and creates negative pressure in the duct. Due to the pressure difference, air is extracted from the building through the duct.

Does it also work if the wind blows from the other side?

Yes. The dome turns automatically according to the wind direction, so ventilation can work regardless of wind direction.

Is it suitable for every chimney?

It is suitable for gravity ventilation ducts and chimneys, but it is not suitable for chimneys in which coal is burned, including pea coal. Before installation, also check the diameter match and the mounting method.

Conclusion

The rotating chimney cowl Ø150 is a practical solution for duct termination, protection against precipitation, and assistance with draft. It is made of acid-resistant stainless steel 1.4404, warranty 2 years.