I have a builder putting up an potter storage facility. All units will only be accessible from the outside. There are approximately 20 units there are connected together but with separate access doors. He wants to heat all of the units with a forced air gas furnace. The furnace will be centralized and ductwork will be ran thru each unit into the next. There will only be 3/4" plywood separating each unit. My question is, do I need to have them put in any kind of dampers between the units? Any help on this is appreciated.