DESIGNED TO REST ON TOP OF THE FIREPLACE DAMPER FRAME AND SEAL THE AREA AROUND THE OVAL FLEX CONNECTOR. INCLUDES 2 PANELS, CROSS BARS TO TIGHTEN AGAINST THE DAMPER FRAME FOR A SECURE FIT AND WING NUTS FOR EASY REMOVAL. PANELS FIT DAMPER FRAMES UP TO 49" WIDE AND ARE DESIGNED TO BE CUT TO THE SAME DIMENSIONS AS THE DAMPER PLATE. INSULATION IS INCLUDED.