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I wonder why you think 70 cfm isn't enough.

The problem may be the type or size of duct being used. u won't get 70 cfm through a 4" flex pipe for example.

If you get a 100+ cfm fan, the ducting will have to be redone for sure.

You're looking at 5 or 6" hard pipe.

All bathrooms even with fans get very humid if someone's showering. the trick is to run the fan for 10 to 15 minutes after the shower.

ask your contractor to put a timer instead of switch.
 

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Your bathroom will stay wet with any size fan if you shut the fan right after showering. There's a lot of water to evaporate from shower or tub surfaces.

The fan should be really be on a separate switch.

If not you can actually do two light switches for the fan/light both feeding the same hot; one a switch, and the second one being a timer.

If you use led bulb, the extra electricity use of running for an extra 15 minutes will be minimal.
 
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