It is then decontaminated with Oxine. The plenum area above the air handler unit is manually cleaned with portable vacuum equipment. It is then decontaminated with Oxine. The access opening is securely closed. If the system is sheet metal, the proper gauge sheet metal is cut to size.
Insulation is put in place if required.
Mastic is applied to the patch opening. The patch is secured with sheet metal screws, duct tape, metal tape, and more mastic. If the system is made of duct board or flex duct, the ten-inch cut out is reinserted. The entire area is fastened with approved duct tape and metal tape to insure a proper seal. The insulation in the air handler unit case is manually cleaned and then treated with Oxine to kill any residual mold, fungus, or bacteria.