Arkay makes a series of ABS darkroom doors that are temporarily affixed to the door frame with flanges and neoprene strips so that they can be "popped out" from within the darkroom for emergency exits. This Arkay 9082 Caster Set for ABS Darkroom Doors allows R2W48ABS and R2W54ABS doors to be rolled to the side instead of lifted in these situations. These casters are heavy duty to support the extra weight of these large doors.
Note: Because these casters are factory installed they must be ordered along with a darkroom door.