If you can give me the model number, I can identify the original manufacturer. It's most likely a Jenn Air unit, but I need to verify that.
Kenmore is just a Sears trade name. The unit was produced by the Roper appliance
company. They would be a good source to check for a similar unit. I'll post back with contact information.
It turns out that Roper appliances are manufactured by Whirlpool. Here are two websites you can check for a new unit, 'www.roperappliances.com', and 'www. whirlpool.com'.
The draft is being created by the downdraft vent fan. The vent hose that's supposed to direct the exhaust out of the house has probably come loose from its flange.