[sailchef]

A lot of commercial refers/freezers have a "vacume down" cycle that sucks the warm air out immediately after you close the door, it lasts for maybe 5 -10 seconds, it sounds like a hissing sound. So, if the door accidentally closes on you and you want to pull it open quickly , you can't, it's being held shut by this vacume. You have to pause and wait until the vacume cycle is complete, or, yank the door hard enough that you move the fridge away from the wall even with the wheel locks on. A real PIA in a big kitchen, especially when you're trying to get back in ,and out, quickly. The one's you're looking at may not have that feature.