The straight curtain rod will need a shower or bathtub that is design in three-wall space only, even if it can be install in regular space, it will spend a lot of space that can be useful for other things, so it is not efficient. While the iron curtain rod needs big attention since it can be rusted if it is not well treated, therefore some people don’t really use this kind of rod for their bathroom. The steel is good for more elegant bathroom where there are several furniture of the bathroom that also use steel to get the same color so that it will match with the decoration of the bathroom. Architecture.