Some of the pizza hoods I have seen , but not done, require some dissassmbly of the oven. I do one pizza place that the oven is vented in the duct, no hood. Obviosly, we remove part of the duct so we don't get water in the oven. I do 2 pizza places that have a rotating shelf in the oven. Those 2 places have clinkers that fall down and can cause problems with the table mechanism. We use a shop vacuum w/a filter to pick up the clinkers.
Douglas Hicks
General Fire Equipment Co of Eastern Oregon, Inc