Duct fittings Surface Area Calculator is a very useful App for mechanical engineers, site supervisors, store keepers… as fact when the ducts are delivered to any construction site the fabricated ducts & fittings surface area will be attached to the delivery note, therefore the storekeeper, site supervisor, or the engineer have to re-check the surface area again to verify the delivery for payment issues…. Our App Duct fitting Surface area Calculator will be very useful in this case… Our App is de