Pneumatic Bulk Truck Retrofitted to Dense Phase Conveying   Pneumatic bulk trucks are completely retrofitted to operate using the latest dense phase technology developed by Dynamic Air Inc. A unique four convey line dense phase pressure system is utilized to maximize the filling of the truck and a dense phase vacuum system is utilized to empty the truck. Fragile materials like toasted bread crumbs or almost any fragile material can be conveyed with only minimal degradation.