I can't figure out any additional details that would improve the question, so let me take this space to say THANKS for your help. I am in Los Angeles County if you happen to know of any L.A./California deviations.

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    What do the installation instructions for the fan say? I don't think NEC says a whole house fan must be on a dedicated circuit, but the manufacturer's documentation might. – Tester101 Jul 9 '15 at 5:12
  • Those I have installed do not require a dedicated circuit, but one should keep in mind the amperage draw and assume normal electric motor issues on the circuit. – Jimmy Fix-it Jul 9 '15 at 19:13
  • I installed it recently on an existing circuit--I don't believe the instructions said to do otherwise. Since then, I have become more familiar with the code, and started wondering if there were some language about it within the context of HVAC or small appliance--in general I've been surprised by the number of things that require their own circuit now. – Phil Esra Jul 10 '15 at 7:35

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