Inconvenience of plunging your home into darkness during a blackout can be averted by installing a metal awning that closes about the window completely and prevents any light from seeping outdoors. Made of rustproof galvanized iron, it guards the window against shattering as a result of explosions or flying bomb fragments. The awning is fireproof, and serves the ordinary purpose of keeping the sun’s glare and heat out of the room. An inside lock prevents the entrance of prowlers.