Bathroom ventilation - to suck or to blow

Greetings,
I recently remodelled a small basement bathroom and added an exhaust fan & a shower.
Now after a year of use, I'm finding that I really need to tie it into my central heating/cooling system for my house to keep the air moving, and to ensure it stays an acceptable temperature. (The previous owners had never done so.)
Should I tie it into the output of my forced air system (blowing into the bathroom) or should I tie it into the air return? My thought is the former, however I have seen the latter done on several occasions (to continue venting the air from a bathroom even after the exhaust fan is shut off).
Thanks for any info,
Rich
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Feed air in is the normal way to do it. I sure would not want the odors and or humidity forced through out my home.
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Rich wrote:

Check your local codes. In my jurisdiction central air returns are not allowed in the bathrooms.
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Geez, I didn't realize there was a difference.
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Hi folks,
Thanks for the input - good points. Definitely putting in an output vent.
Appreciated,
Rich
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