Any bath vent fans made for old work?

I'm helping a friend who wants to install a bath fan/light in a ceiling in a bathroom that does not have one now. There is a floor above, so there is no access above the ceiling. I've looked at Broan, Nutone, Panasonic and Air King websites and all are designed to install either in new construction, or where you have access from above in old construction.
One would think someone would make a unit that could be put into an application like I have, without having to tear open and then refinish the sheetrock beyond the fan area. Anyone know of any?
TIA
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
AND where would you vent it too?

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
HotRod wrote:

That's not a problem, it's std 2X8 joists, so I can run the vent to an outside wall. What I was hoping to find was a unit where you can cut a square hole in the sheet rock between, or next to a joist, and be able to do the install through that opening, without additonal access.

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
I've had pretty good success with some of the Broan models. You pretty much have to have a 12 inch space in the ceiling and a clear bay to the outside for the duct. You do have to cut about two inches longer than the unit to get the fitting on the duct, and you have to make your cut against a beam so you can screw through the unit into the beam to mount it. Over all it comes out pretty clean

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

I used a Panasonic "WhisperFit" unit that should be usable, although you won't be able to use all the mounts. The easiest mount would be to glue some 1/4"-1/2" plywood strips to the backside of the wallboard so you can screw the unit to that. You install the end of the unit first, with the wiring and the vent, attaching it to the joists with its extendable mounts, and then slide the fan box into that through the hole. Be sure you allow for the thickness of the vent outlet when putting in the plywood. Try it before you glue it.
Bob
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.