chimney cowl

chimney cowl

A revolving metal ventilator over a flue which induces updrafts and prevents downdrafts; a chimney cap, 2.
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Mr White said he was thinking about a chimney cowl.
They were to find at least ten shapes and record them, for example a padlock on a student's locker, a keyhole, a chimney cowl, a crumpled bit of waste paper, the space seen at the end of a corridor with an open door protruding into it, or an electric plug all presented as shapes with no interior detail.
But Charlotte insists that the firm's boss did not return after fitting two chimney cowls and being up on the roof for about half an hour.