The Vacu-Stack is the best solution for wind induced downdrafts on chimneys, both masonry and prefabricated chimneys. Stops wind from blowing into the chimney regardless of the wind direction. Accelerated air flow around the Vacu-Stack causes flue gasses to flow up and out of the chimney.
This model is designed for use on a masonry chimney with proper adapter. A masonry adapter for this model is included and will fit a chimney from 10" x 14" up to a 14" x 18" chimney flue.
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