The Harmony Aluminum deck railing system. The Fastest and Easiest Aluminum Deck Railing System on the Market Today. Combine the durability, strength, and low maintenance of aluminum all while meeting North American Commercial & Residential building codes. Harmony Aluminum balcony railings are ideal for both professional and do-it-yourself installations. Whether installed on a residential deck, or a commercial aluminum railing project, you can rest assured the 15-year finish warranty and low maintenance of Harmony Aluminum System will provide years of satisfaction and safety.