Hi, I have a two stage cascade lab system running 403b and Ethylene. I've been told that 404a is a replacement for 403b, and 407f is listed as a replacement for 404a. My business partner has a tank of 407F (and a 407C tank) in his warehouse and I'm interested in this route to get my machine (Virtis Sentry 3.3EL lyophilizer/coldtrap) back in service -- will 407 work?
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