Fan for a Half Bath?

Building Codes

I have a downstairs 1/2 bath (toilet and sink only), with an exhaust fan previously installed. I recently had a need to remove the exhaust piping from the fan to the outside vent, due to birds invading the venting...

The bathroom is very small, and does not contain a shower or bathtub. It has also never had a problem with moisture. I am wondering if I really need to have the piping replaced, or if I can simply just cap off the outside vent outlet and be done with the job. Are there any building code considerations here? Is a bathroom exhaust fan really necessary in this case?


Most codes require a fan or an operable window for a half bath (toilet and sink). The reason for such a requirement has to do with bathroom odors and the potential for sewer gases.

Will you be arrested for not having a fan? Most likely not. Is the fan a good idea? Yes!

To keep the bird out I would cut a small piece of hardware cloth screening and fit it over the vent cap. George