The X Mullion frame door is recessed in the back to accept a single piece of glass.
Standard mullion width is 1".
Available only in "7000" & "7500" series doors.
See "7000" & "7500" series door profile specifications for details.
Back recess is grooved for plastic glass retainer which is supplied with doors at no extra charge.
Minimum size is 12" wide x 24" high
Minimum height is 2 x width
