If you are hunting for upright freezer racks for large 3 ¾-inch boxes, Custom Biogenic Systems is the place to be. We offer large 3-3/4" box upright freezer racks in a number of configurations to fit any shelf you have. From four boxes up to 20 boxes, we have the LN2 freezer racks for you. All of our upright liquid-nitrogen freezer racks for 3 ¾-inch boxes are made from high-quality stainless steel right here in the USA. Each of our liquid-nitrogen freezer racks for 3.75-inch boxes comes with sturdy handles for easy transportation. Find the configuration that works best for your freezer space. You can go with a single rack or buy whatever you need. Check out our full selection of large 3-3/4" box upright freezer racks, and get yours on order today.