Hi - We use coolers for blood storage (1-6C) in the O.R. and some select locations in the hospital. Validation is performed when new, once/year, and as needed, using LogTag temp recorders with probes inserted in expired RBCs. Two trials per cooler, min (1 RBC) and max (6 RBCs) are performed. When 6 RBCs are validated, one LogTag on either end unit and one in the middle. I was wondering, for those sites using similar type validations, when you test your max capacity, do you open the lid intermittently during the trial or do anything else to try to mimic actual use? Thank you.