b'1 Panel 2 Panel 3 Panel 5 Panel1-3/8 + Fire Rated 1-3/8 + Fire Rated` 1-3/4 + Fire Rated 1-3/4 + Fire RatedTrue 90 Angle1-3/8 Door Thickness 1-3/4 Door Thickness1/2 Panel Thickness3/4 Panel Thickness21'