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How do you figure out a load estimate for a pizza poular. There are 4 ovens /hood/a new 2200cfm exhaust fan / a new 1800cfm gas fired make-up air unit.The make -up air is dumped in thru 5 2x2 4way ceiling registers.So, on any HOT day that air is 80* 90* 100*f and in desperate need of being cooled. I for one, do not want my pizza guy sweating on my slice The existing 5t rooftop is a little small now,I think.The building is 25'x20'x20' w/ a hung cieling @10' /no insulation above ceiling tiles. One good thing is the roof is painted SILVER. But I think the roof is really painted SILVER to torture us roof dwellers.This place might be a wind tunnel w/ all of this air moving about .This is on Long Island N.Y.