5.1 Site Preparation a. Conduct a pre-inspection of the ductwork system. b. Isolate the HVAC system to prevent dust migration. c. Place protective coverings over equipment, furnishings, and flooring in the work area. d. Ensure proper access to ductwork (via existing or newly installed access panels). 5.2 Duct Cleaning a. Use mechanical agitation tools (e.g., brushes, air whips) and HEPA-filtered vacuum systems to remove debris, dust, and contaminants from the interior duct surfaces. b. Clean all accessible supply ducts, branches, and plenums. c. Dispose of removed debris in accordance with environmental regulations. d. Document the cleaning process with before-and-after photos. 5.3 Surface Preparation a. Visually inspect ducts for corrosion, biological growth, or damaged insulation. b. Remove any remaining loose debris, rust, or contaminants using abrasive or chemical cleaning as necessary. c. Dry the duct interior completely to ensure proper adhesion of lining materials. 5.4 Duct Lining Application a. Apply an approved, HVAC-rated internal duct lining product (e.g., antimicrobial elastomeric coating or fiberglass encapsulant). b. Ensure uniform coverage throughout the ductwork, maintaining specified thickness per manufacturer’s recommendations. c. Apply coating using spray equipment, rollers, or brushes depending on duct size and configuration. d. Allow adequate drying/curing time as per product specifications.
