Patent ID: 7112350

Claim:
A method for applying liquid liner material to the interior surfaces of an air duct comprising the following steps: a. inserting a first end of a supply line through a first opening in an air duct that is to be lined and pushing the first end of the supply line through the air duct so that the first end of the supply line stops at the entrance to the supply plenum for an air conditioning unit that provides conditioned air to the air duct, b. initiating flow of liquid liner material to the material to a spray device attached to the first end of the supply line via the supply line that has its opposite second end attached to a supply pump and supply tank that are designed to supply liquid liner material through the supply line to the spray device and simultaneously with initiating a pulling force on the supply line and the attached spray device so that the spray device deposits liquid liner material onto the interior surfaces of the duct continuously between the first opening in the duct and the entrance to the supply plenum as it is pulled through the duct.