MRI Split, Swinging Stop Sign

Mounts separately from the door. Even with the door open, the sign continues to block the entrance and then can be pushed through separately.
Fits a standard 48" door opening. Sign itself is 42" in diameter

The Safety Stop should be installed with 2-1/2” wood screws if the door jamb is of standard wood construction. 
If door jamb is made of other materials, or if you are unsure of the jamb construction consult with the shielding manufacturer for suggested types of fasteners.