Abstract: The closing mechanism of an automatic door closing arrangement is partly enveloped by an elongated unitary casing of sheet metal. Flanges on two of the longitudinal casing walls bound therebetween an opening in the casing which may be closed by a panel releasably retained by the flanges. Provisions are made for attaching the casing to a door and for linking the output element of the closing mechanism to a door frame. The panel may be removed simply and without tools for access to the mechanism or for replacement by another panel of different decorative appearance.