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Does the new fan have a timer option? If yes, it might be wrong to assume you can wire it with just your two wires. I recently installed a timered vent axia fan in place of a non timer fan, thinking I could wire it without a permanent live and it would operate like a non timered fan.
I was wrong, the circuitry in the vent axia timer fan required the permanent live to be there in order to work, so what was supposed to be a 30 minute job turned into an all day one digging up my floor boards to find a suitable location to wire off.
Not really fussed how it comes on, just want it to take air out when using the shower.
The old fan definitely only had two wires going into it, and the new fan only has two connections so the only two wires are attached correctly.