curvy metal vent

abstract ac air background building closeup conditioner conditioning corrode corrosion curvy danger defunctional detail deteriorate deterioration dirty duct dusty grate grille grime grunge grungy heat hot industrial iron line lines metal neglect old orange oval oxidize pattern ribs rust rusting rusty shape shapes steel strand strands surface swirl tarnish texture twirl unit vent ventilation wallpaper warm wavy weathered wire