Is your bathroom over a crawlspace or basement? It would have been
better to do the ducts before yo completed the work. Are you using the
vent just for heating or do you air condition as well. What climate do
you have?

Check this out. If you are using ac in a humid climate, you could grow
mold or rot in your crawlspace or basement under your vanity toespace
grille.

Crawlspace problems
http://www.contractingbusiness.com/C...S=&NI L=false



Stretch