Bilco Ultra Series Polyethylene Basement Door Extension

The Bilco Ultra Series Polyethylene Basement Door Extension are for the Bilco Ulltra Series Basement Doors only. The door extensions can be mounted back to back for longer areaway lengths. Bilco's door extensions are fastened to the back angle of the Bilco Door side panels. The cover panel is installed to assist the flanges overlap the side panels and the header flange of the Bilco door. The extensions are offered in 6in. and 12in. widths.