// CODE SNIPPET
518.0 Downdraft Appliances
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A downdraft appliance ventilation system containing, or for use with appliances used in processes that produce, smoke or grease-laden vapors shall be equipped with components that are in accordance with the following:
- The clearance requirements in accordance with Section 507.4.
- The primary collection means designed for collecting cooking vapors and residues in accordance with the requirements of Section 508.0.
- Grease removal devices that comply with Section 509.0.
- Special-purpose filters as listed in accordance with UL 1046.
- Exhaust ducts that comply with Section 510.0.
- The air movement requirements in accordance with Section 511.2.1 and Section 511.2.2.
- Auxiliary equipment (such as particulate and odor removal devices) are in accordance with Section 512.0.
- Fire-extinguishing equipment that is in accordance with the requirements of Section 513.0, and as specified in Section 518.3.
- The use and maintenance requirements in accordance with Section 514.0.
- The minimum safety requirements in accordance with Section 515.0. [NFPA 96:15.1.1]
The downdraft appliance ventilation system shall be capable of capturing and containing the effluent discharge from the appliance(s) it is serving. [NFPA 96:15.1.2]
Fire-extinguishing equipment on a downdraft appliance ventilation system shall comply with the following:
- Cooking surface, duct, and plenum protection shall be provided.
- Not less than one fusible link or heat detector shall be installed within an exhaust duct opening in accordance with the manufacturer's listing.
- A fusible link or heat detector shall be provided above the protected cooking appliance and in accordance with the extinguishing system manufacturer's listing.
- A manual activation device shall be provided as part of the appliance at a height approved by the Authority Having Jurisdiction.
- Portable fire extinguishers shall be in stalled in accordance with Section 513.11. [NFPA 96:15.2]
A listed downdraft appliance ventilation system employing an integral fire-extinguishing system including detection systems that has been evaluated for grease and smoke capture, fire extinguishing, and detection shall be considered to be in accordance with Section 518.3. [NFPA 96:15.2.1]
The downdraft appliance ventilation system shall be provided with interlocks such that the cooking fuel supply will not be activated unless the exhaust and supply air system have been activated. [NFPA 96:15.2.2]
An airflow switch or transducer shall be provided after the last filter component to ensure that a minimum airflow is maintained. [NFPA 96:15.3.1]
The airflow switch or transducer shall be a manual reset device or circuit. [NFPA 96:15.3.3]
Surfaces located directly above the cooking appliance shall be of noncombustible or limited-combustible materials. [NFPA 96:15.4]
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