I'm in discussions with a manufacturer of energy recovery ventilators. They recommend that their ERVs be served by a dedicated circuit. When I ask why, they say, "In order to protect ourselves and our customers we recommend a dedicated circuit," but they refuse to elaborate on why or how a dedicated circuit protects them or their customers. They say it's a "legal" issue. These units are so energy-efficient (as low as 34 watts) that I can't believe they are concerned about overloading a shared circuit. Does anyone know of other reasons why a dedicated circuit would be advisable?