These vintage cast iron windows are a great addition to your home or project. To install them, make sure the opening where you plan to place the window is the right size (1800 x 1200 wide). Just lift the window carefully and fit it into the opening. When using, open and close the windows gently to avoid any damage to the cast iron. For maintenance, wipe the windows regularly with a dry cloth to keep them clean. If you notice any rust spots, use a light sandpaper to gently remove them and then apply a thin coat of paint to prevent further rusting. Keep them away from harsh chemicals as they can damage the metal finish.