I have my new york modulating installed. At least so far it is wonderful. The install guy who i've used before and trust, installed an additional return---on the floor. I realize exact placement isn't important, and that fact the other returns are high doesn't bother me. But is a return on the floor more likely to have crap (coins come to mind) dropped into it, or knocked into it? There is just a regular grate. It seems like there should be a cheese cloth or something to stop small objects?