Here is the closest thing I know of. There are a lot more details that will be needed before you can order anything. This one is a little over budget, but I am not sure you will find one in budget. Maybe someone else will have some better info.

Here is a link that might be useful: Imperial from venting direct

Rob, that is just about perfect! I always like to call and verify that the product will work for me, but it looks like it will. I am waiting for a credit for my defective hood, but once that goes through I'll be ready to purchase.

Thank you!

If you can find this on sale, as I did 2 years ago, it's an amazing hood insert: Sirius SU 901.

Here is a link that might be useful: Pro series SU 901 power pack

I posted a similiar question on the appliance forum a few days ago. You can see what they recommended. See link.

Here is a link that might be useful: Appliance Forum - Mantle hood vent

We have a smaller Sirius insert and have been happy with it.