Joining two exhaust bathroom fans into one exhaust?

I’m considering this, take 2 4" exhausts and pass them through a 6" exhaust out the roof, any thoughts on this?

No can do

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Chris, they each need their own exhaust and around here it has to be hard piping. No flex exhaust.

You’ll want to insulate it well against condensation dripping back to the fan.

I like to put them out the gable under the insulation.

Good luck.

Thank you guys. Chris