HVAC Cleaning Inspection Checklist: Verify Your Vendor Across All Three Standards
Most HVAC checklists are written for the technician doing preventive maintenance. This one is written for you — the facility manager verifying that a cleaning contractor actually did the work, across ducts, kitchen exhaust, and cooling towers.
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Why This Checklist Is Different
Search this topic and you'll find two kinds of documents: NADCA's authoritative duct-cleaning checklist, and software vendors' generic technician PM templates. Neither does the facility manager's real job, which is auditing the vendor: one building, three cleaning standards — NADCA ACR for ductwork, NFPA 96 for kitchen exhaust, ASHRAE 188 for cooling tower hygiene — and one person responsible for proving all three were met. This checklist unifies them, and pairs every line item with the proof you should ask for.
Get the Printable Checklist
Is your commercial or industrial facility's air quality safe for people and products? Use this checklist to inspect your HVAC system for optimal performance and to determine if it's time for some cleaning maintenance.
- Section 1: Air Duct Cleaning Verification (NADCA ACR)
- Section 2: Kitchen Exhaust Cleaning Verification (NFPA 96)
- Section 3: Cooling Tower Hygiene (ASHRAE 188)
Section 1: Air Duct Cleaning Verification (NADCA ACR)
Use after any commercial air duct cleaning. The governing idea in the NADCA ACR standard is source removal with verification — if it can't be verified, it wasn't cleaned.
| Checklist item | What proof to ask for |
|---|---|
| Entire air-conveyance system in scope (air handler, coils, supply and return runs) | Written scope listing every system component — not "ductwork" as one line |
| Source-removal method used (mechanical agitation + HEPA-filtered negative air) | Equipment list on the work order; photos of collection equipment in place |
| Post-cleaning cleanliness verification performed | Surface-comparison or visual verification results; before/after photos of representative sections |
| Access openings properly created, documented, and resealed | Photo log of access points; resealed panels visible on walkthrough |
| Coils cleaned and drain pans clear | Before/after coil photos; visible drain flow |
| Inaccessible areas disclosed | Written exceptions list — a report with zero exceptions on an older system deserves questions |
Section 2: Kitchen Exhaust Cleaning Verification (NFPA 96)
Use after every kitchen exhaust hood cleaning. NFPA 96's test is bare metal — not "visibly cleaner."
| Checklist item | What proof to ask for |
|---|---|
| Hood, filters, and plenum cleaned to bare metal | Spot-check with a white cloth on the plenum interior; before/after photos |
| Full duct run cleaned — horizontal and vertical, through all access panels | Photo at each access panel; panel locations marked on a simple system diagram |
| Exhaust fan cleaned (blades, housing) and rooftop grease containment serviced | Rooftop photos — this is the most commonly skipped item in the industry |
| Missing access panels identified for installation | Written deficiency note with locations |
| Service sticker applied with date, company, and areas not cleaned | The sticker itself — inspectors and insurers look for it |
| Written report retained for your records | Report filed where your fire inspector can be shown it on request |
Section 3: Cooling Tower Hygiene (ASHRAE 188)
Use after cooling tower cleaning, and align it with your building's water management program.
| Checklist item | What proof to ask for |
|---|---|
| Basin sediment fully extracted (not stirred and drained) | Post-cleaning basin photos showing bare basin floor |
| Fill, louvers, and drift eliminators washed without damage | Before/after photos; note of any fill degradation found |
| Strainers and sumps cleared | Walkthrough check at startup |
| Disinfection performed per your water management plan (when required) | Chemical, concentration, and dwell-time record for the program file |
| Condition findings reported (corrosion, scale, fill wear) | Written condition report — the input your capital plan needs |
| Documentation filed in the water management program records | Dated report matching your ASHRAE 188 plan's recordkeeping requirement |
Ohio vs. Florida Seasonal Inspection Calendar
Service-Tech crews work both climates, and the inspection rhythm differs:
- Ohio (heating/cooling changeover climate): inspect ducts and air handlers at each seasonal changeover; schedule cooling tower cleanings at spring startup and fall shutdown; verify kitchen exhaust before the winter months concentrate rooftop work into harder weather windows.
- Florida (year-round cooling, high humidity): there is no off-season — towers run continuously and humidity keeps biological growth pressure high year-round, so inspections are calendar-driven rather than season-driven, with extra attention to condensate areas, coil condition, and microbial growth in duct systems.
How to Use This Checklist With Any Vendor
Hand it to your cleaning contractor before the job and say the documentation column is a deliverable. A professional crew will not flinch — photo documentation and written exceptions are standard practice for contractors working to NADCA, NFPA 96, and ASHRAE 188 expectations, and it's how Service-Tech has documented work across 100,000+ facilities since 1960. If a bidder resists providing proof, you've learned something valuable at quoting time instead of at inspection time. For vendor-selection and budgeting guides, see the resource library and the blog; complex multi-system facilities can scope everything under one industrial cleaning services engagement.
What an Inspection Should Physically Check
A walk-through that only looks at grilles has not inspected the system. Six checks tell you the real condition.
- Borescope the runs. Interior surfaces beyond arm's reach are where the deposit actually is. A camera on a rod settles the question in minutes.
- Swab and weigh. A gravimetric sample against the NADCA acceptance figure turns "looks dusty" into a number you can put in a scope of work.
- Check the liner. Press a lined run and see whether fibre releases. A liner that sheds under light pressure will not survive brushing, and the decision becomes encapsulate or replace.
- Read the coil pressure drop. Airflow restriction across the coil face quantifies fouling that a torch cannot see, and it is the figure that connects cleaning to energy cost.
- Straighten and inspect fins. Bent fins throttle airflow independently of how clean the surface is.
- Open the plenum and the fan. The air handler interior, the drain pan and the fan housing foul faster than the duct they feed, and they are the components most often skipped.
Frequently Asked Questions
Who Should Use This Checklist — My Techs or My Cleaning Vendor?
You, on behalf of the building. It's a vendor-audit tool: your maintenance team can walk it during and after any contracted cleaning to confirm scope was delivered. Technician PM checklists (filters, belts, refrigerant) are a different document serving a different purpose.
What Proof Should a Duct Cleaning Vendor Give Me?
A written scope covering the entire air-conveyance system, photos of containment and collection equipment in place, before/after photos of representative duct sections, verification results, and a written list of any inaccessible areas. Under the NADCA ACR framework, cleaning without verification is an unfinished job.
What Does "Clean to Bare Metal" Actually Mean for Kitchen Exhaust?
It means grease removed down to the metal surface throughout the system — hood, plenum, the full duct run, and the fan — not degreased where visible. NFPA 96 uses this as the cleaning endpoint, and a white-cloth spot check inside the plenum is a fast, fair field test any operator can perform.
What If a Vendor Can't Produce This Documentation?
Treat it as a scope gap, not a paperwork gap. Documentation is how fire inspectors, insurers, health authorities, and your own water management program confirm the work happened. If proof isn't available after the job, assume the skipped photos correspond to skipped work — and require the documentation column in writing next time.
Does Verification Documentation Cost Extra?
It shouldn't be treated as an add-on; ask each bidder to include documentation in the base scope. Service-Tech includes written reports and photo documentation as part of professional practice, and every estimate is free — so you can require proof without paying a premium for honesty.