Patent ID: 8529992

Claim:
A method of applying a coating to a duct in communication with an air supply unit, comprising: (a) inserting a first end of a supply line including a spray head and a camera through a first opening in an air duct that is to be coated so that the first end of the supply line stops at the entrance to the supply plenum for an air supply unit that provides air to the duct; (b) initiating flow of coating material to the spray head through the supply line that has its opposite second end in communication with a supply pump and supply tank that are designed to supply coating material through the supply line to the spray head; (c) retracting the supply line and the attached spray head and camera from the supply plenum, toward the first opening so that the spray head deposits coating material onto the interior surfaces of the duct between the supply plenum and the first opening in the duct while capturing the deposition of coating material using the camera (d) Simultaneously displaying the deposition of coating material captured by said monitor.