DuraVent Direct Vent Pro Ceiling Support / Wall Thimble Cover Plate is used as a decorative cover plate for a horizontal venting application to cover the wall thimble. It can also be used for flat ceilings as a trim collar. The cover comes with an insulated ring to reduce any infiltration through the ceiling or wall. The cover plate measures 13" x 13" and extends into the room 2". The black finish will match the black piping.