On 12/6/2010 8:14 PM, Daniel Prince wrote:
wrote:

The metal can is most likely just the junction box for the heater.

All of these that I have ever seen are surface mounted units. Yours may have
a recessed junction box as mentioned above. You should have drywall under
what you remove.

It is NOT surface mounted. I removed the old heater. Most of the
heater was inside the round metal can which is just under 13 inches
in diameter and about 7.75 inches deep. The bottom of the can is
flush with the ceiling drywall. With the heater removed, there is a
big, deep, hole in the ceiling. The hole is the size of a large
cake or a hatbox.

If you can get to the top side in the attic, putting in a modern square
one is no big deal. Sweep the insulation back, get the old one out, cut
the right-size hole, and mount. I have done it from below, but it is a pain.

--
aem sends...