  
Stops Down Drafting. Wind driven, the slightest breeze provides positive ventilaton with no chance of down drafting. Totally enclosed ball bearing system. No additional maintenance. Please Note: This type of cap only works when the wind blows. It will not solve a smoking problem cause by negative air pressure of a poor drafting chimney. Can be adapted to a square or rectangular massony chimney with our adaptor plate. Made in the USA.
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