Designing Kitchens and Bathrooms - bathroom fan venting rules

I am looking for a way to vent two separate bathroom fans. currently they are just dumping into the atic. When I posed this situation to someone in the contruction field they suggested that I utilize the sewer vents. The sewer vent is a 3" copper pipe. I was thinking of using a 3" QWIK-TEE. This is a rubberized pipe for fixing or altering. My first questions is how do I find out if this is ok according to the local code here in Michigan. I am also wondering if I will run into any problems from water coming in from the vent. thanks for any help or direction you can give me.

k8moores, Welcome to the DIY Forums.
Tying into a bathroom vent doe's not meet ANY code I am aware of. Even if you had no codes to deal with, this would be very dangerous. The sewer vent is exactly what the name implies. It vents sewer gas into the atmosphere. If you tie into it, anytime the fan was not running, the gas would have a direct path into the room. Bathroom fans and vents are intended to be directed to the outside of the house either through the roof or the sidewall.
Venting a bath fan into the attic is creating a breeding ground for mold and mildew. Good luck.

as an alternative what about venting it out of the eves? Again I was at the local hardware and found a vent that mounts under the eves. I know this is not the roof or an outside wall but it is January and I have no outside walls in my atic. Again I wold appreciate any input. :)

My fault. I didn't mention an eave vent. Perfectly fine. You just don't want moisure in the attic. Good luck.

thanks for the conformation.

My lower Bathroom is in the front of the home On the main floor. Venting outside would mean putting a vent which will be on our veranda wall in the front of the house. I would like to avoid doing this. One wall of the bathroom is beside the garage. The garage is a single car garage with three solid block walls and a metal garage door. The question I have is can i vent into the garage ? What implications would the moisture in the garage have. Thanks

canchris7,

All bathroom and kitchen exhaust fans must vent to the outside.

Into a garage is not to the outside.

Moisture will destroy drywall and eventually raise havoc on wood. Mold and mildew are real issues.

There are nice looking vents - colors are available.

http://www.fantech.net/accessories4.htm - See HS or VK (louvered vent)

Hope this helps!

Thanks Doug, I did consider the mold issue, however i thought that maybe beacuse the garage was all block no drywall or wood in there, i thought it might be ok. Thanks for your post.