Model 3400 1″ thick panels are lightweight and designed for pedestrian and cart traffic. 3/4″ square steel tubular frame. Foam core provides insulation and sound attenuation. 1/8″ ABS facing resists impacts, dents and gouges. 21″ clear high by full door width vision for maximum visibility at opening. Other standard vision options provide flexibility to improve visibility at opening. 3/4″ cam rise, gravity close hardware standard for ease of operation. Full perimeter gasketing is available for superior sealing. Aluminum and stainless steel options allow for use in washdown applications. Variety of options to fit the specific application.