Fire flange signs aluminum fire extinguisher fire flange signs clearly mark the location of fire alarms, extinguishers, hoses and more. Flange signs protrude 90 from wall, making them visible from both sides. Great for indoor and outdoor use. Signs feature radius corners for safety. Aluminum signs are made of .040 reinforced baked enamel that is both corrosion-free and uv-resistant to permanently withstand harsh elements. Flange signs are predrilled on corners for easy installation. Meets osha 29 cfr 1910.157 requirements & nfpa 101 life safety code.