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 9081 Caster Set for ABS Darkroom Doors allows R2W28ABS, R2W28ABS and R2W28ABS doors to be rolled to the side instead of lifted in these situations.
Note: Because these casters are factory installed they must be ordered along with a darkroom door.