5500 Window Series   Single Glazed Vinyl - 5500: 1 3/8 Set Back Nail-On Frame - 5501: 1 Set Back Nail-On Frame - 5530: Flush Fin Frame - 5550: Block Frame 3/4" Dual Glazed Vinyl - 5520: 1 3/8 Set Back Nail-On Frame - 5521: 1 Set Back Nail-On Frame - 5560: Flush Fin Frame - 5580: Block Frame       5500: 1 3/8 Set Back Nail-On Frame   Horizontal Slider   XO OX XOX O OO OOO Stacked Horiz O/O XO/XO XOX/XOX XO/O XO/OO XOX/OOO O/XO OO/XO OOO/XOX