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System is passive so battery switch can be off unless you have an electric door seal. That is why power failures at altitude in unpressurized mode can cause the cabin to pressurize suddenly, when the dump solenoid loses power.
I haven't done it but if I was doing it I would connect the blower via some kind of adaptor hose to the hose (after the inline venturi) entering the cabin through the firewall. eg. see attached for what the front engine part looks like. Note you would likely have to pull the rear engine dump valve as this also closes the connection from the cabin to the non-running engine.
Good luck - let us know how it goes.
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