Portiere rods, Rising portiere rods, Swing arm portiere rods are designed to fit over doors where a curtain is necessary to keep out draughts. Dorma rods and drapery are are designed to fit small windows and dorma windows where there is limited space inside a dorma recess. French poles are designed to keep the draughts in, as the curtain pole has a return this allows the curtain to keep tight to the wall.