Completely sealed with double gasketed glass for an air tight seal. Swing Stop™ retention cable keeps glass from abruptly swinging down. Captured thumb screws & closure mechanism for ease of use and excellent sealing. 95% reflective European aluminum interior offers excellent reflectivity and diffusion. 8†integrated air-cooled fittings with bead ring. Galvanized steel housing with major brand powder-coating. EZ Breeze® aerodynamic junction box. Overall Dimensions: 27.9L x 21.3W x 9.2H Glass Frame Dimensions: 22.3L x 21.3W