True Vented Louver Doors by Supa Doors. Used in swinging, sliding, bifold, bypass, or pocket applications. This door is using a 2-1/4" louver blade. When looking at Louver Doors, choose a door with a minimum of 2-1/4" wide louver blade to give an upscale, plantation style look. Try to avoid the smaller 1" or 1-1/2" louver blades. Also look for doors that offer a limited lifetime warranty.