Tunnel Available as a single walkway with a maximum span of 5 meters: by joining one ore more units sideways covering of large areas is possible aluminium columns, roof carrier profiles, guttering etc in natural aluminium of powder coated RAL colours at additional cost the rear, sides and front my be closed by fixed awning cloth or awning roller blinds with or without clear PVC windows standard frame colours: natural aluminium - white RAL 9010 or black RAL 9011 Surcharge other RAL colours: 20% comes complete with support frame