FEB4 Panel Height: 7" H (4U space) Available in a choice of flanged or flat style (for flanged style see SKU DF1557), these economical steel blank panels feature a durable black powder coat finish. Panels are constructed with 14-gauge steel. Racking Height: -1 3/4" (1U space). -3 1/2" (2U space). -5 1/4" (3U space). -7" (4U space). -8 3/4" (5U space). -10 1/2" (6U space).