Old school external heavy-set canvas blinds During the Canberra Fires. The embers flew in, hit the canvas blinds, and, because of their incline, simply rolled off. And when his fence burned up past his windows, those drawn canvas blinds offered significant radiant heat protection from that adjacent fence fire. And, although they charred very, very slightly so they discolored a little bit, they didn't burn in situ and provide an additional heat load to his windows. And just a word of warning, they’re the old school heavy-set canvas blinds, and the caution there would be that all blind materials probably aren't created equal.