It is an oval corbelled drystone hut, just 2.3 by 2.1 metres across and surviving to a height of 1.1 metres, with walls nearly a metre thick. Corbelled construction means the stones are laid so that each course projects slightly inward over the one below, eventually closing into a roof without any mortar or timber involved. The technique is ancient and appears throughout the Dingle Peninsula, though the precise age of any individual example is rarely easy to pin down.

The structure was recorded as part of the Corca Dhuibhne archaeological survey published by J. Cuppage in 1986, a systematic effort to document the extraordinary density of archaeological remains on the Dingle Peninsula. Gleann Fán sits within a landscape that has been shaped by small-scale pastoral farming across many centuries, and structures like this one were likely used as temporary shelters during seasonal movement of cattle to upland grazing, a practice known in Irish as booleying. Whether this particular example belongs to that tradition or to an earlier period of settlement is not something the physical remains alone can settle.