You may know this but it never hurts to remind everyone. NEVER inhale directly from the can horn. The venturi can be very aggressive and serious lung damage can occur if you inhale from the horn and the venturi kicks in hard. Always use a hose loop when testing a DH cracking pressure or Venturi.
I have had people laugh at me about this. This is real. And I suggest not to do this especially with a single stage like Mistral because that Venturi is shooting full tank pressure right down the throat. Might get away with it 10 times, maybe a hundred times, maybe not even one time! Just saying. Put a hose loop on.
James