I have a wall where i want it to put a 3 gang box for switches and in this only section i wanna put is a cold air return. can you put the box with romex wire or does it has to be a different way or no way...looking forward to hear your feedback and recommendations...
Wires are are only allowed to pas the cold air return and you are not allowed to inistal the electrical box in return although some inspectors allow the foam box if thats the only spot for switches my recommendation is to inistall the wireless switches which you can have the receivers under the vanity or any place allowed by electrical code book and inistal the flash mounting wireless remote controller anywhere you like and be safe.
See CEC 2015 12-010 (Wiring in ducts and plenum chambers). Subrule (5) 'Where a furnace cold-air return duct is formed by boxing in between joists, wiring methods specified in
this Section for use in the particular location shall be permitted to be used. Consult Table 19 for appropriate cable types
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