The DLS curtain system is manufactured in Ontario and features a heavy duty 16oz. ripstop fabric. This fabric is the heaviest curtain fabric on the market! There are no cables or pulleys on the system, and there are no wrinkles with the keder tube. The system comes complete with 1.66″ galvanized windpipes and heavy duty galvanized doors and end covers. Natural ventilation curtains, baffle curtains, and inlet curtains are available in fully automatic or manual options.