Scope of Work Details - HVAC DUCT CLEANING TAWES D-POD .pdf

Scope of Work Details Project: HVAC Duct System Cleaning and Related Services Location: 580 Taylor Avenue, Maryland Department of Natural Resources – Tawes Building, Annapolis, MD D-

POD

1. Project Overview This Scope of Work (SOW) outlines requirements for the cleaning and restoration of HVAC ductwork, air handling components, and ventilation systems throughout the Tawes Building. All work shall be performed in accordance with the following industry standards:

● National Fire Protection Association (NFPA)

● North American Insulation Manufacturers Association (NAIMA)

● National Air Duct Cleaners Association (NADCA)

● Sheet Metal and Air Conditioning Contractors Association (SMACNA)

● Underwriters Laboratories (UL)

Completion of OSHA Outreach Training (10-hour and/or 30-hour) is desirable but not mandatory.

The Contractor shall furnish all labor, materials, equipment, supervision, and tools necessary to complete the work.

2. Scope of Services

2.1 Removal and Cleaning of Registers, Vents, Grilles, and Diffusers

1. Remove all registers, vents, grilles, and diffusers as needed.

2. Vacuum and/or hand-wash all components to remove dust, dirt, and debris.

○ Cleaning shall improve appearance and indoor air quality.

2.2 Drop Ceiling Access

3. Remove drop ceiling tiles as required to gain access to the duct system.

4. Report damaged ceiling tiles to the Building Manager.

5. Reinstall ceiling tiles after work is completed.

2.3 Insulation Removal (As Needed)

6. Remove exterior insulation, where necessary, by cutting clean access points using appropriate tools.

2.4 Installation of Access Ports

7. Install access ports in ductwork as required for complete system access and source removal.

Ports shall comply with NFPA, NAIMA, NADCA, SMACNA, and UL guidelines.

Access Ports Shall Permit:

a. Full reach of internal duct surfaces

b. Complete source removal

2.5 Use of Agitation Devices

Industrial Brushes (If Applicable)

8. Utilize industrial brushes to loosen debris.

○ Brushes shall be selected based on duct size and type of surface.

Compressed Air (If Applicable)

9. Use compressed air to loosen debris within ductwork.

○ Main and side runs may be isolated and cleaned separately.

2.6 Vacuum Collection Requirements

All vacuum collection equipment must utilize High-Efficiency Particulate Arrestance (HEPA) filtration.

High-Powered HEPA Vacuum Systems

10. Use negative pressure equipment during brushing and compressed air cleaning.

○ Minimum capability: 2,500–5,000 CFM with 4–5" static pressure

○ Multi-stage filtration including pre-screen, bag filter, and HEPA filter

Portable HEPA Vacuums

11. Use industrial-grade portable HEPA vacuums for close-access cleaning.

2.7 Microbial Treatment (If Applicable)

12. Apply an EPA-registered bacteriostat/fungistat/deodorizer, such as EnviroCon, where applicable.

○ Non-aerosol formulations only

○ The application may require airless fogging equipment

Note: No product may be represented or applied as a ductwork “sanitizer,” as none are EPA-approved for that purpose.

2.8 Protective Coatings (If Applicable)

13. Apply protective coatings to interior insulation or metal duct surfaces when required.

○ Product data and application specifications must be submitted to the Owner for approval.

2.9 Variable Air Volume (VAV) Boxes (If Applicable)

14. Create access ports if needed.

a. HEPA vacuum interior surfaces

b. Secure loose wiring

c. Inspect insulation and report damage

2.10 Reheat Coils (If Applicable)

15. Access coils by creating ports if necessary.

a. HEPA vacuum or brush fins

b. Apply EPA-approved coil cleaner and rinse

c. Clear condensate drain

d. Report any damaged fins or insulation

2.11 Air Handling Unit (AHU) Cleaning (If Applicable)

16. Clean AHU components, including:

a. Interior surfaces (HEPA vacuuming, brushing, scraping, wiping)

b. Condensing coils

c. Filter racks

d. Blower compartment and blades

e. Dampers and louvers

f. Optional sanitizing per Section 12

g. Reporting of any damaged or deteriorated components

3. Inspections and Sealing

3.1 Post-Cleaning Inspection

17. Conduct post-cleaning inspection with the Building Manager

3.2 Access Port Closure Requirements

18. Install airtight removable plates or doors in compliance with industry standards.

Requirements:

● Metal panels shall match or exceed the existing duct gauge

● Mechanically fastened every 4" on center

● Sealed with UL-181A tape, gasket, or mastic

● Materials must be corrosion-resistant

● No installation may compromise duct structural, thermal, or functional integrity

● All materials must be UL- and NFPA-compliant

4. Restoration and Clean-Up

4.1 Reinstall Registers and Ceiling

19. Reinstall all registers, vents, grilles, diffusers, and ceiling tiles in original locations.

4.2 Clean-Up

20. Remove protective coverings. Sweep floors and vacuum carpets.

4.3 Final Inspection

21. Conduct a final walk-through with the Building Manager and verify that all work has been restored to its original condition.

○ Obtain sign-off on Certificate of Completion for Approval

5. Scheduling

● Work shall be coordinated with the Superintendent and/or designee

● Areas that are required to be unoccupied during cleaning may require weekends or after hours.

5. Scheduling