Rotating chimney cowl with ball bearings Ø250, acid-resistant steel (inox)

Rotating cowl for better draught in ventilation ducts and chimneys

The rotating chimney cowl Ø250 is intended for finishing gravity ventilation ducts and chimneys. Wind creates negative pressure in the duct, and the pressure difference helps extract air from the building. The cap rotates automatically according to the wind direction, so operation does not depend on where the wind is blowing from.

Main advantages

• Acid-resistant stainless steel 1.4404 provides a suitable solution for use on ventilation ducts and chimneys.
• Ball bearings in oil ensure long-lasting, quiet operation without failures.
• Automatic rotation of the cap adjusts the cap position to the wind direction.
• Protection of the duct helps protect the duct against precipitation and draught disturbances.
• Assistance with weak draught is useful with a too short chimney, turbulence, a location among trees or in a valley, and when the chimney is lower than the roof ridge.

Use and installation

The cap is suitable for finishing gravity ventilation ducts and chimneys, especially when the draught is weak or absent. The nominal diameter is 250 mm, and the inner sleeve diameter is 251.5 mm. The total height of the cap is 540 mm, the sleeve height 160 mm.

It can be installed directly on the duct with the sleeve or on the base. A version with a base is also available on the product page, with a square mounting plate 400 mm and a 90 mm high ring; the plate is fastened to the chimney top with 4 screws. The cap is not suitable for chimneys in which coal or pea coal is burned.

Frequently asked questions

How does the rotating cowl help with draught?

When the cap rotates, the wind creates negative pressure in the duct, and the pressure difference helps extract air from the building.

Does the cap work regardless of wind direction?

Yes. The cap rotates automatically according to the wind direction, so ventilation also works when the wind direction changes.

Can I install it without the base?

Yes. The cap can be installed directly on the duct with the sleeve. If needed, a version with a base is also available for mounting on the chimney top.

Conclusion

The rotating chimney cowl Ø250 made of acid-resistant stainless steel is a practical choice for finishing ventilation ducts and chimneys when you want protection from precipitation and help with draught disturbances. The product has a 2-year warranty.