31 x 12

White Vinyl Gliding Window
31-3/4 x 12
XO Unit
White Internal & External
Lowe 
Flangeless windows (also known as block/box frame windows) are installed without a traditional exterior nailing flange, often used in European-style retrofits or masonry applications. Instead of nailing through a fin, these units are secured directly through the frame or with clips and rely on specialized, high-performance sealant and tape for waterproofing.