Commercial Air Duct Cleaning Scope of Work Should Include the Following

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The HVAC and ductwork in commercial buildings should be inspected each year (per the NADCA ACR-21 , see Table 1). An inspection or assessment generally leads to a maintenance plan. Every facility has different needs, so a specific HVAC restoration and duct cleaning scope should be prepared after an assessment and photo report are completed during an onsite walk-though at the facility.

HVAC Cleanliness Inspection Schedule (Recommended Intervals)
Building Use Classification Air-handling Unit Supply Duct Return Duct / Exhaust Duct
Residential 1 year 2 years 2 years
Commercial 1 year 1 year 1 year
Industrial 1 year 1 year 1 year
Healthcare 1 year 1 year 1 year
Marine 1 year 2 years 2 years

Learn more about the DUCTZ approach to assessing and cleaning commercial HVAC systems:

Who is Considered to be Qualified Personnel for your HVAC Assessment?
A qualified assessor should have the knowledgebase of HVAC systems and their components with a viable work history cleaning and assessing HVAC systems and ductwork. Qualifying certifications include DUCTZ CQA (Certified Quality Assessor), NADCA ASCS (Air Systems Cleaning Specialist), NADCA VSMR (Ventilation System Mold Remediator) and NADCA CVI (Certified Ventilation Inspector).

Standards Used for Cleaning and Restoration of HVAC
The National Air Duct Cleaners Association (NADCA) current ACR Standards in addition to the ACCA Standards and IICRC S500, S520, S590, S700 and S760 all speak to the proper steps to the assessment, scope, cleaning and restoration of HVAC systems.

Documents Needed and Provided
It is best to provide mechanical (M-#) prints and legends for the building to the assessor to include completed and proposed construction and all mechanical HVAC revisions.

The assessor will provide a photo report with suggestions, scope of work and often a proposal to complete the assessed work.
NOTE: mechanical prints are incredibly helpful, but the most accurate assessment will come from prints and a job site walk-through.

Assessment and Scope of Work Will Include
Visual Assessment is necessary for all components including:

  • Air handlers (rooftop units and package units included)
  • Blowers
  • Coils
  • Registers and Diffusers
  • Supply and Return Ductwork (turning vanes and dampers)
  • Air Volume Control Devices
  • Exhausts
  • Drain Pans

A proper scope and cleaning plan or proposal should include:

  • Accurate Quantities: ductwork size and linear footage, air handler counts and size in tons, component counts (registers, diffusers, VAV boxes, exhaust fans, drain pans)
  • Cleaning Methods required to restore the HVAC system and components (generally source removal methods with mechanical agitation and negative air to collect and filter debris being removed) but a more complex method could be required per the NADCA ACR 21 – Section 4:
  • Time and Labor Required (including special labor provisions; night work, prevailing wage)
  • Environmental controls and containment considerations
  • Safety Precautions (managers assigned, safety manuals and site-specific safety plan)
  • Accessory Items Needed (lifts, scissor lifts, scaffolding)
  • Personal Protection Equipment
  • Property Protection Equipment
  • Disposal Plans for debris and consumables (filters, poly sheeting, basic trash)
  • Suggestions for damaged or frayed ductwork, ductwork liners, flexible boots and flexible duct
  • Chemicals to be used (SDS and master labels provided) – including coating products and anti-microbial products

Contracts shall be signed and agreed before work begins and shall include:

  • Price (hard price, NTE or not to exceed price or time and material agreement)
  • Time
  • Special Considerations such as wage provisions

Cleanliness Verification and Visual Inspection
The HVAC system will be inspected visually to ensure that no visible contaminants are present. Cleanliness verification shall be performed immediately after mechanical cleaning and before the system is powered back on. Cleanliness verification only determines if there is a presence of particulate after cleaning, not if there is microbial contamination or hazardous materials present.

Post-Cleaning Report
A full assessment report should include before and after photos of all HVAC components and sections of the ductwork, taken from the same vantage points.

A before and after photo report is provided on all DUCTZ projects.

For more information, please visit the NADCA Commercial Checklist online:

DUCTZ is an international franchise system adhering to the highest industry standards to ensure that our customers benefit from the best Air Duct Cleaning, Coil Cleaning, Dryer Vent Cleaning and Exhaust Cleaning in the industry. Don’t believe us, we will prove it!


  • We never use the “too good to be true coupons” or Groupons
  • DUCTZ adheres to strict standards put forth by the EPA, NADCA and ASHRAE
  • DUCTZ adheres to the EPA’s Post-Cleaning Consumer Checklist for Air Duct Cleaning
  • DUCTZ provides a Picture Perfect Report on each job, a compilation of before and after photos of each project

To schedule your Air Duct Cleaning and Dryer Vent Cleaning, visit: or call (877) 382-8987

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