I have a situation, dry system running in heated space below the attic in part of the building. In other parts, within the attic space. Where it is running in the heated area, sprinklers are pendent type. So the need for dry pendents or return bends. The contractor doesn't want to install individual return bends for each pendent head (for cost reasons). Instead he is proposing to make the entire branchline as the return bend. The branchline to have a riser at the connection to the main. Then from the branchline drop down directly to each pendent head. Any problems?
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