Use of a rear register on your gravity vented furnace will allow you to heat a rear adjoining room with a single heater. In order to use the rear register for heating an adjacent room, the heater must be recessed into a wall. This accessory cannot be used in conjunction with the GWTR-2W Out-of-the-Wall Installation Kit.
It is for use with Empire GWT-25W and GWT-35W Gravity Vented Wall Furnaces. It is in white to match your furnace.
This item replaces the GWTR-1.