The lee (down-wind) zone of the windbreak. The level of sheltering depends on the aerodynamic porosity of the windbreak, the local topography, the height and the angle of the windbreak to the wind. In addition, the shelter becomes less with increasing distance away from the windbreak. Fabric porosity also affects the degree of turbulence in the sheltered zone.

When wind hits a vertical barrier it is thrown vertically. An inclined barrier throws the wind up at an angle. This more gradual process gives a longer flatter protected area behind the windbreak.

Fire resistance in terms of Australian Standard 1530 for Textiles (T3).