b'4 PANELSMOOTH4 PANEL - SMOOTHSIZE THICKNESS HOLLOW CORE2-0 x 6-8 1-3/8" 1842-4 x 6-8 1-3/8" 1852-6 x 6-8 1-3/8" 1862-8 x 6-8 1-3/8" 1873-0 x 6-8 1-3/8" 1881-3/4 solid core doors are 20-min fire rated4 PANEL SMOOTHDOORS INTERIOR Note: New products are shown in RED.76 Millwork Book | February 2021 Table of Contents'