Technical Foundation
What Is a Grease Duct and Hi Temp Access Door?
A grease duct access door is a code-required opening built into commercial kitchen exhaust ductwork that allows inspection and cleaning crews to remove accumulated grease along the entire duct run, as mandated by NFPA 96. Doors must be installed at specific intervals and locations (typically every 12-20 feet, plus at each change of direction) and must match the duct's fire rating so the access point doesn't create a weak point in the fire-rated enclosure.
Because grease ducts often run through fire-rated shaft enclosures, access doors used on these sections must carry a matching fire rating (commonly 1.5 or 2 hour) and be labeled accordingly, distinguishing them from a general-purpose HVAC access panel. Material selection (typically stainless steel or galvanized steel) and gasket type must withstand sustained high temperatures and periodic exposure to grease-fire flare conditions without degrading the seal.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Fire Rating | 1.5 hour, 2 hour, or unrated | Must match the fire rating of the duct enclosure it's installed in per NFPA 96 and local code |
| Material | Stainless steel, galvanized steel | Stainless steel resists grease and heat degradation better over the duct's service life |
| Size | Sized to allow hand and tool access for cleaning, per code minimum dimensions | Undersized doors fail inspection even if otherwise compliant |
| Latch/Seal Type | Cam latches with high-temp gasket | Must maintain an airtight, grease-tight seal under sustained duct operating temperature |
| Installation Spacing | Per NFPA 96 — typically every 12-20 ft and at direction changes | Determines how many doors a given duct run requires, not just door selection |
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Applications
Where Grease Duct and Hi Temp Access Doors Get Used
Grease duct access doors are specified anywhere NFPA 96 or local fire code requires periodic inspection and cleaning access along a commercial kitchen exhaust run.
Commercial Kitchen Exhaust Systems
Access doors installed at code-required intervals along grease duct runs for scheduled cleaning by certified duct cleaning contractors.
Restaurant & Foodservice Construction
Fire-rated access doors specified during new kitchen build-out to satisfy NFPA 96 and local fire marshal inspection requirements.
Institutional Kitchens (Hospitals, Schools)
High-temperature access doors installed on grease ducts serving large-volume institutional cooking equipment.
Industrial Process Exhaust
High-temperature access doors used on non-grease industrial exhaust ducts carrying elevated-temperature process air.
Duct Cleaning & Fire Inspection Services
Access doors relied upon by cleaning contractors and fire inspectors to verify grease accumulation levels without duct disassembly.
Kitchen Hood Retrofit & Remodel
Replacement or additional access doors installed when a grease duct run is modified or extended during a kitchen remodel.
FAQ
Grease Duct and Hi Temp Access Doors Questions, Answered
Why does a grease duct need a fire-rated access door instead of a standard one?
Grease ducts frequently run through fire-rated shaft enclosures separating floors or occupancies. Installing a standard, unrated access door in that section would create a gap in the fire rating, so codes require the access door itself to carry a matching fire rating (commonly 1.5 or 2 hour) and be labeled and listed for that use.
How often do grease duct access doors need to be installed along a duct run?
NFPA 96 sets minimum spacing requirements — generally an access panel every 12 to 20 feet of horizontal or vertical run, plus at every change of direction — so cleaning crews can reach the entire interior surface. Exact spacing depends on duct size and configuration, and local fire code amendments can be more stringent.
What material should the access door be made from?
Stainless steel is the most common choice for grease duct access doors because it resists both the corrosive effects of accumulated grease and the high, sustained temperatures inside the duct better than galvanized steel over the system's service life.
Do access doors need a special gasket or seal?
Yes — grease duct access doors require a gasket rated for sustained high temperature and grease exposure to maintain an airtight seal. A standard rubber gasket used on general HVAC access panels will degrade quickly in this environment and can fail during a grease fire event.
Who inspects grease duct access doors, and how often?
Local fire codes and NFPA 96 require periodic inspection and cleaning of grease exhaust systems, typically by a certified kitchen exhaust cleaning contractor, at a frequency based on cooking volume (ranging from monthly for high-volume 24-hour operations to annually for low-volume kitchens).
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