Go to this thread:
http://www.montanaowners.com/forums/...17&whichpage=1
it is a still current thread about the Apollos
Many convection ovens will not have that fan or one even available. If you get a replacement Apollo make sure what comes with it. I don't know since when I need a replacement none, Apollos, were available. Those heat elements throw a lot of heat into the cavity which must be evacuated.
Mid-West Sales, 800-772-7262,
http://midwestsales.org/products.php?c=Microwave
I replaced my Apollo last winter with a Sharp and I had to rig a cavity evacuation fan. Hot. It works and well. We'll see how it stands up. With some jiggery pokery I was able to reuse the old Apollo trim ring.