Completely sealed—featuring hinged glass and double gasket for an air-tight seal. Includes tempered glass, built-in socket and 15′ lamp cord. 95% reflective European aluminum interior for excellent output and uniformity. FREE upgrade! 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. D644185. Patent Pending: 29/434634.