A Type II hood is used when performing holding, reheating, baking, or using an enclosed deck type pizza oven that produces only heat and steam.
International Mechanical Code – Type II Hood
According to the International Mechanical Code, Type II hoods are to be installed above dishwashers and appliances that produce heat or moisture, and do not produce grease or smoke as a result of the cooking process. Type II hoods are required to be installed above all appliances that produce by-products of combustion and do not produce grease or smoke as a result of the cooking process.
Note:  that you will have to consult with the Authority Having Jurisdiction for final determination.
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