The Rotoflex chimney cowls are devices that utilize wind power for chimney draft support.
When to use?
Installation on the exits of flue gas and smoke chimneys
To improve and stabilize a chimney draft
In the situation of an unfavorable placement of a chimney exit, and air swirls causing the chimney to work improperly
If the building is located in a strong wind zone
To protect the duct against precipitation