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Stable draught
Uses wind energy to support steadier flow at the chimney outlet.
COWLS & TERMINALS360° control of
360° control of
chimney draught
Self-adjusting stainless-steel cowls use the force of the wind to stabilise draught, limit backflow and protect the chimney outlet in changing weather.
450°Cmaximum operating temperature
AISIacid-resistant stainless steel
II–IIIrecommended wind zones
type ZK-RK
FEATURED SOLUTION
Self-adjusting chimney cowltype ZK-RK
The rotating head follows the wind direction and creates negative pressure at the flue outlet. This supports a steadier chimney draught while the low-resistance construction helps flue gases leave efficiently.
Designed for demanding conditions
!Not intended for condensing gas boilers.
What a correctly selected cowl can improve
Backflow protection
Helps reduce the risk of reverse draught during gusts and turbulence.
Weather protection
Limits rain and snow entering the chimney and supports drier flue conditions.
Quiet movement
A rolling-bearing mechanism supports smooth, stable rotation.
WHEN TO CONSIDER A COWL
A practical answer to difficult roof conditions
A technical adviser or chimney professional should confirm the final selection. A cowl is commonly considered when:
- 01The chimney draught is weak or unstable
- 02Wind turbulence repeatedly occurs at the outlet
- 03The building stands in a valley or near taller obstacles
- 04The flue needs better protection from moisture
- 05The property is exposed to wind zones II or III
SAFE INSTALLATION01 02 03 04
A secure connection starts below the cowl
Before installation, the chimney must be unobstructed and in good condition. HENITOM adapters and transitions allow the cowl to be fitted to round, square ceramic and traditional masonry outlets.
Inspect
Check the flue, outlet and ventilation conditions.
Match
Choose the correct diameter, adapter and fuel application.
Secure
Mount the assembly stably and keep the service points accessible.
Maintain
Schedule regular inspection, cleaning and bearing checks.
TECHNICAL BASIS
Materials and operating range
- Construction
- Acid-resistant and stainless austenitic steel
- Steel grades
- AISI 1.4404 and 1.4301
- Mechanism
- Self-adjusting rotating head with rolling bearings
- Temperature
- Up to 450°C
- Applications
- Solid fuel, selected atmospheric gas applications and gravity ventilation
- Standard
- CE; EN 1856-1:2009
Frequently asked questions
Will a cowl fix every draught problem?+
No. The appliance, air supply, flue dimensions, chimney height and outlet location must be assessed as one system. The cowl supports correctly designed installations.
Can it be fitted to a ceramic or masonry chimney?+
Yes. A correctly selected transition or adapter allows stable installation on round, square ceramic and traditional masonry outlets.
Is it suitable for a condensing boiler?+
No. This self-adjusting cowl is not intended for condensing gas boilers. Ask a technical adviser to select the correct terminal for that appliance.
Does the mechanism need servicing?+
Yes. The cowl should be inspected and cleaned regularly together with the chimney, and the rotating mechanism should be checked for free, quiet movement.
NEED HELP WITH SELECTION?
Match the cowl to your chimney, appliance and roof conditions.
Send the basic installation details and our team will help you choose a safe configuration.
