Grabill’s luxury exterior bifolding door systems accommodate multiple panels for large expanses. When closed, these precision engineered doors create a formidable barrier against the elements. Door panel configurations are as specified with in-swing or out-swing operation. Folding doors are also available in all-wood and aluminum-clad. For more information on Grabill Windows and Doors, please visit our website or call us directly at 810-798-2817.