Based on the diagram, the light & vent (which each typically use < 100W) share a neutral and the heat (typically ~ 1500W) has its own neutral. You can't mix & match neutrals. Either they all get combined and the neutral wire runs next to all the switched hot wires in conduit or in a single cable, or then must be kept matched together.. 17. Install heater in ceiling only - at least 6 inches from any wall. 18. Do not connect heater to dimmer switch or speed control. 19. Provide a separate 20 AMP circuit. Use 12 GA. power cable of type which meets code. Use supply wiring rated for at least 90OC. 20. For greatest efficiency, install heater so heat is directed toward tub or shower.

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3. Using wire nuts (not included), connect house power wires to fan wires. 4. 14 AWG (2.1 mm2) is the smallest conductor that may be used for branch-circuit wiring. Each power wire (light, fan, heater) must have its own switch to operate independently. 5. For supply connections, use wire rated for at least 90ºC. See wiring diagram for wire size.. Heater vent lights are essential components of any home heating system, providing illumination and a comfortable level of warmth to your living space. Installing a heater vent light requires knowledge of both electrical wiring and air ducts, making it a difficult task for the uninitiated. While the process may seem intimidating, having a wiring.