There is no replacement fan for that model that will fit in the existing housing. You can buy the replacement motor assembly.
You can buy these online and have them shipped to you: http://parts.broan-nutone.com/nutone/Shop?actn=quicksearch&searchtype=all&indextype=7&keyword=qt100l&Search.x=0&Search.y=0 or http://www.centralvacuumstores.com/search/search.php?keywords=qt110&x=47&y=15&asug= or http://www.partstore.com/Part/Broan-Nutone%20Group/Broan/0696B000.aspx?s=froogle
Answers & Comments
There is no replacement fan for that model that will fit in the existing housing. You can buy the replacement motor assembly.
You can buy these online and have them shipped to you:
http://parts.broan-nutone.com/nutone/Shop?actn=quicksearch&searchtype=all&indextype=7&keyword=qt100l&Search.x=0&Search.y=0
or
http://www.centralvacuumstores.com/search/search.php?keywords=qt110&x=47&y=15&asug=
or
http://www.partstore.com/Part/Broan-Nutone%20Group/Broan/0696B000.aspx?s=froogle