Guide
Duct access panels missing — what to ask the contractor
If the duct can’t be opened, it can’t be inspected or cleaned to bare metal. Missing, blocked, or undersized access panels are one of the most common reasons a “full clean” still leaves grease in the path — and why the written report’s inaccessible-areas list matters more than the canopy photos.
Short answer
Secondary sources citing NFPA 96 (2024 ed.) require all interior exhaust surfaces to be accessible for cleaning and inspection. Horizontal grease ducts need openings at changes of direction; where a 20×20 in personnel opening isn’t possible, cleaning openings at intervals not exceeding 12 ft. Vertical runs need adequate access on each floor when personnel entry isn’t possible. Panels must be grease-tight and restored after service; opened panels get a service tag. Ask the contractor what is missing, what they will cut/install, what stays inaccessible on the report, and who owns the panel retrofit cost. Your AHJ’s adopted edition wins.
What “enough access” usually means (secondary)
| Location | Common secondary rule of thumb | Operator check |
|---|---|---|
| Whole system | All interior surfaces accessible for cleaning and inspection (§4.1.8 cited) | Can every horizontal and vertical section be reached somehow? |
| Horizontal duct | Openings at sides or top and at direction changes; 20×20 in for personnel entry where size allows; else openings large enough for thorough cleaning ≤12 ft apart | Walk the run: direction changes and long straights with no door = gap |
| High openings | If not reachable from a ~10 ft stepladder, safe access / work platform needed | Ceiling chase panels you can’t stand at don’t count as usable |
| Vertical duct | Adequate access each floor when personnel entry isn’t possible; openings at top of riser when entry is possible (older industry primers also stress this) | Multi-story kitchens: one door at the hood does not clean the shaft |
| After the visit | Access panels restored; service tag near panels that were removed (§12.6.9 / §12.6.10 cited by secondary sources) | Look for tags + sealed doors — not open holes or missing gaskets |
Good contractor answers
- Lists panel locations (or missing ones) on the inspection/cleaning report
- Separates cleaning price from access-panel install / fire-rated chase work
- Uses grease-tight, duct-equivalent panels — not sheet-metal “lids”
- Photos through each opened door when cleaned
- Writes inaccessible sections instead of claiming “everything” was done
Weak answers
- “We’ll clean what’s accessible” with no list of what isn’t
- One lump sum that buries cutting new openings
- Pushback on duct photos or panel tags
- Sealing over openings from a prior remodel and calling it done
- Confusing HVAC return-air doors with grease-duct access doors
Ask the contractor (send this list)
- Inventory — How many grease-duct access panels exist today, and where? Which direction changes have none?
- Gaps — Which sections will be marked inaccessible on the written report if we don’t add openings?
- Install scope — Will you (or a sheet-metal / listed-panel installer) cut and install grease-tight doors? Listed / fire-rated where the chase requires it?
- Price split — Cleaning labor vs. panel materials/labor as separate lines
- Clearance — Are existing doors blocked by other trades (pipes, cable trays)? Who clears them?
- Proof — Path photos + panel tags + inaccessible-areas list within the two-week report window secondary sources cite
- Fan interface — If duct connects both sides of a fan, is there access within ~3 ft each side (older industry primer; verify against your adopted edition)
What the written report must list when panels are missing
Missing panels are not just a construction problem — they show up as required disclosure lines on the inspection and cleaning reports. Secondary sources citing NFPA 96 (2024 ed.) make the inaccessible-areas list the operator’s proof that a “full clean” was honest. Confirm against the edition your AHJ adopts.
| Report / tag item (secondary cite) | Why it matters when doors are missing |
|---|---|
| §12.6.14.1 inspection report — areas exceeding grease limits; inaccessible areas not inspected; accessible areas not inspected; locations of duct access panels; visible duct leakage; leaking access panels | If panels are missing, the inaccessible list should name the direction changes and long straights that could not be opened — not a vague “system OK” |
| §12.6.15.2 cleaning report — inaccessible areas not cleaned; accessible areas not cleaned; access panel locations; duct leakage; leaking panels | Canopy photos without this list usually mean the duct path was never proven |
| §12.6.10 — when an access panel is removed, a service company tag (company name + date) affixed near the affected panels | Opened doors get tags; missing doors get named as inaccessible until installed |
| §12.6.9 — access panels and cover plates restored after service | Open holes or missing gaskets after a visit are their own deficiency — not a finished clean |
Operator move: put the inaccessible-areas and panel-location lines on your acceptance checklist before you pay the invoice. Use the cleaning report checklist and the two-week report window guide to hold the vendor to delivery timing. Panel tags sit next to the hood service label — both belong in the on-site binder. If the report names long inaccessible runs, schedule grease-tight panel installs as a separate line from the next clean (see full-system vs canopy).
Who it’s for / not for
- For: operators after a deficiency notice about inaccessible duct, facilities managers bidding a multi-story kitchen, anyone whose last report never named panel locations
- Not for: DIY cutting into grease duct without a qualified installer / AHJ path, or treating “we washed the canopy” as proof the duct is clean
Sources
- HoodFilters — NFPA 96 excerpts (2024) (secondary; §§4.1.8 accessibility; 7.3.1 openings at direction changes; 7.4.1.1–7.4.1.3 horizontal openings / 12 ft / ladder access; 7.4.2.2 vertical)
- Facilitec Southwest — NFPA 96 codes notes (secondary; report must list inaccessible areas; access-panel service tags §12.6.10; restore panels §12.6.9)
- Complete Kitchen Exhaust — access panel installation notes (secondary; §7.4 spacing / direction-change framing)
- Phil Ackland — need for proper access (PDF) (secondary / older edition citations; 12 ft, direction changes, vertical / fan-adjacent access patterns)
- US Made Supply — NFPA 96 access summary (secondary; 20×20, ≤12 ft, blocked cleanouts after other trades)
- Facilitec Southwest — cleaning report & service label requirements (secondary; §12.6.14.1 / §12.6.15.2 inaccessible lists; §12.6.10 panel tags)
Next step
Walk the duct path (or send roof/ceiling photos) and mark every direction change and long straight with no door. Put that sketch in the bid package and require inaccessible sections named on the report — then price panel installs separately from the clean.