Stainless steel spherical swivel nozzle Ø150 NOK150N

Stainless Steel Spherical Rotating Cap Ø150 – Operation and Installation

The cap operates on the principle of automatic rotation in response to wind, generating negative pressure in the chimney and improving the draft of gravity ventilation systems. This reduces the risk of flue gas backflow – especially during strong wind gusts, with low chimneys, or in close proximity to buildings and trees. It requires no maintenance or electricity, and its operation is continuous and reliable.

All moving parts are enclosed in a sealed housing with ball bearings immersed in oil – ensuring quiet operation and long-term resistance to moisture, dust, and corrosion. No lubrication or inspections are required – just install and forget.

Construction and Durability

Made from stainless steel sheet type 1.4404 (316L), with a thickness of 0.6 mm – a material known for its high resistance to acidic precipitation, seawater, and aggressive atmospheric factors. This is not ordinary stainless steel – it is a chromium-nickel-molybdenum alloy that maintains integrity even under prolonged exposure to external conditions.

The base measures 250×250 mm and features pre-drilled mounting holes (spacing 195×195 mm), allowing for quick and secure attachment to the chimney. Mounting bolts are included in the set – no additional purchases required. The cap is disassemblable, facilitating inspection by a chimney sweep: simply remove the cap to access the interior of the chimney.

Applications and Advantages

• Operates without electricity – ideal for single-family and multi-family homes with gravity ventilation systems.
• Prevents reverse draft – especially with low chimneys or in areas with poor airflow.
• Protects against rain and snow – the spherical shape deflects precipitation, preventing it from entering the chimney.
• Simple installation – requires no specialized equipment or technical expertise.
• 5-year warranty – confirmation of quality workmanship and material.

This is not a decorative element. It is a functional tool – designed to operate for years without failure, even if the chimney is located on a seaside house roof or in a city with high pollution levels.