Invoice just says 'flue liner', not specific type/style. I can ask him though. The photos attached show the old UFO- style and the new smaller cowl - the one on the left.
We have an Ecoburn+ gas stove, and on the chimney is a clay cowl. When windy, the noise echoing down the flue and within the stove chamber is quite loud. We've replaced the cowl with one that's meant to suppress noise, but its barely made a difference. The fitter who installed the system says...