Completely sealed featuring hinged glass and double gasket for an air-tight seal. Includes tempered glass, built-in socket and 15 ft lamp cord. Highly reflective aluminum interior for excellent output and uniformity. Swing Stop® retention cable keeps glass from abruptly swinging down. Captured thumb screws & closure mechanism for ease of use and excellent sealing. Air-cooling flanges have a bead ring to keep ducting securely in place. Powder-coated galvanized steel housing. Patent No.: D543,652, D570,295, D613,900, D698,628.