Completely sealed-featuring hinged glass and double gasket for an air-tight seal. Includes tempered glass, built-in socket and 15" lamp cord. Highly reflective textured 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. Reflector Dimensions: 22.5"L x 18.5"W x 7.25"H Patent No. D644185 Patent Pending: 29/434634.