Forty inches square gives a projection close to its width, which suits a side door or a back entrance where a wide panel would overhang the step and drip in the wrong place. The construction matches the rest of the range: hollow polycarbonate sheets with an anti-UV coating for UPF 50+, aluminum bars for support and molded brackets that will not rust. It handles a 44 lb snow load and grade 4 wind, with water running off rather than pooling. Coffee-toned sheets. Assembly is required and the fixings come in the box.