Can we meet the requirement for ultra-clean operation room (10CFU/m3) with dilution ventilation?Christoffer Pedersen, Guangyu Cao, Finn Drangsholt, Liv-Inger Stenstad and Jan Gunnar SkogåsE3S Web Conf., 111 (2019) 01041DOI: https://doi.org/10.1051/e3sconf/201911101041