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The cowl was fitted to the top of the kiln roof of an oast house. It pivoted with the wind to allow the hot air from the fired kiln below to be drawn through the hops and out through the top.

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An Oast House is a building used to dry fresh hops before they are sent to the brewers, to be used for flavouring beer. A typical Oast House consisted of the 'oast' and the 'stowage'. The oast was a kiln, with a plenum chamber fired by charcoal at ground floor and the drying floor directly above. The steep pitched roof channelled the hot air through the hops to the top. The stowage, was the barn section, it had a cooling floor and press at first floor and storage area at ground floor. …read more about Oast Houses Link