The open ridge as a ventilator in livestock buildings.

The open ridge is a ventilator commonly used in cattle buildings. Reviews literature on the open ridge. Finds that there is outright disagreement between the sources referenced. Describes wind tunnel study to show whether or not the ridge design could influence the pressure coefficients when subject to wind. Finds there is no practical difference in pressure coefficients generated at the ridge of a building whether there are no upstands, upstands alone or with caps. For a 0deg. wind upstands have almost no effect on the pressure coefficients along the ridge, but the placing of a cap has a marked effect on the magnitude of the pressure coefficients. As the wind swings round to 90deg. there is a tendency for the capping to reduce the pressure coefficient but only on the leading portion of the model. At 90deg. there is no difference due to ridge design.