Method for retrofitting a register box with an expandable polymeric foam material

Abstract

A method of insulating a register box in which the register box has a body and a duct. The method includes accessing the register box such that the interior of the register box can be reached, removing existing insulation from the interior of the body of the register box, injecting an expandable polymeric material into the interior of the body of the register box, and allowing the expandable polymeric material to cure for a period of time. The opening of the duct of the register box is blocked during the step of curing. The step of injecting includes inserting a foam gun into an interior of the body of the register box and directing the expandable polymeric material from the foam gun toward a wall of the body of the register box.

Dependencies are inferred from the claim text.