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POW R2 / TH10 output in parallel with switch

Hi everyone! I’m planning to use POW R2 and TH10 devices in parallel with ordinary light switches to command exhaust fans. My intention is to be able of turning on an exhaust fan both manually - using an ordinary light switch - and electronically through a Sonoff switch. My question is that may I damage the Sonoff having power applied to the output line of a Sonoff POW 2 or TH10 switch? Thanks in advance!

I don't think it will cause a problem since the Sonoffs use internal relays.  You would just be back feeding an open contact inside the Sonoff.  Note that the POW will not be able to detect power usage whenever the manual switch is on.

Great! That’s what I was hoping for! Thank you for your help. Best!
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