ok, electric (convection) pizza ovens, gas fired pizza ovens, don't produce "grease laden vapors " like a deep fat fryer or range cook top or broiler will. i'd say a type 2 hood is sufficient for the pizza oven. not a type one with supression, which would be required over a fryer (actually dry chem) due to grease/water splash issues, but you ... More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.