I have written several articles lately explaining the limitations of storing flammables and toxics. A couple of these articles referenced the International Fire Code (IFC) which is my favorite safety code for hazardous materials. OSHA’s 1910.106 is from the 1969 NFPA 30 and has not been sustainably updated since; whereas the IFC gets updated every three (3) years. In the IFC the limitations for storage and handling are based on the process/system being “open” or “closed”, and of course a closed system is permitted to handle much more of the HAZMAT. So what is the difference?