RE:Admission Chamber MUSt Be Changed Each Time A legit concern... but how much does an avoidable exposure event cost? Lost man hours with employees isolated and or quarentined. For 300 you save thousands. The ones with the replacements on hand are prepared, The real unacceptable cost is when you are shut down. I hear your concern (even though I should probably ignore most of what you post) but I think on balance it is not a deal breaker. Once licensed after-market producers will bring that cost down ... wait, who said anything about licensing? Well I just did becuase it seems logical.