// CODE SNIPPET
50.5.6 Cleaning of Exhaust Systems
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A measurement system of deposition shall be established to trigger a need to clean when the exhaust system is inspected at the frequencies in Table 50.5.4. [96:11.6.1.1]
Hoods, grease removal devices, fans, ducts, and other appurtenances shall be cleaned to remove combustible contaminants to a minimum of 50 µm (0.002 in.). [96:11.6.1.1.1]
A grease depth gauge comb, as shown in Figure 50.5.6.1.1.2, shall be placed upon the surface to measure grease depth. [96:11.6.1.1.2] 
FIGURE 50.5.6.1.1.2 Depth Gauge Comb.
Where a measured depth of 2000 µm (0.078 in.) is observed, the surfaces shall be cleaned in accordance with 50.5.6.1. [96:11.6.1.1.3]
Where a measured depth of 3175 µm (0.125 in.) is observed in a fan housing, the surfaces shall be cleaned in accordance with 50.5.6.1. [96:11.6.1.1.4]
Hoods, grease removal devices, fans, ducts, and other appurtenances shall be cleaned to remove combustible contaminants prior to surfaces becoming heavily contaminated with grease or oily sludge. [96:11.6.2]
At the start of the cleaning process, electrical switches that could be activated accidentally shall be locked out. [96:11.6.3]
Components of the fire suppression system shall not be rendered inoperable during the cleaning process. [96:11.6.4]
Fire-extinguishing systems shall be permitted to be rendered inoperable during the cleaning process where serviced by properly trained and qualified persons. [96:11.6.5]
Flammable solvents or other flammable cleaning aids shall not be used. [96:11.6.6]
Cleaning chemicals shall not be applied on fusible links or other detection devices of the automatic extinguishing system. [96:11.6.7]
After the exhaust system is cleaned, it shall not be coated with powder or other substance. [96:11.6.8]
When cleaning procedures are completed, all access panels (doors) and cover plates shall be restored to their normal operational condition. [96:11.6.9]
When an access panel is removed, a service company label or tag preprinted with the name of the company and giving the date of inspection or cleaning shall be affixed near the affected access panels. [96:11.6.10]
Dampers and diffusers shall be positioned for proper airflow. [96:11.6.11]
When cleaning procedures are completed, all electrical switches and system components shall be returned to an operable state. [96:11.6.12]
When an exhaust system is inspected or cleaned, a certificate showing the name of the servicing company, the name of the person performing the work, and the date of inspection or cleaning shall be maintained on the premises. [96:11.6.13]
After cleaning or inspection is completed, the exhaust cleaning company and the person performing the work at the location shall provide the owner of the system with a written report that also specifies areas that were inaccessible or not cleaned. [96:11.6.14]
Where required, certificates of inspection and cleaning and reports of areas not cleaned shall be submitted to the AHJ. [96:11.6.15]
Metal containers used to collect grease drippings shall be inspected or emptied at least weekly. [96:11.6.16]
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50.5.6 Commercial Cooking, Cleaning of Exhaust Systems
If upon inspection, the exhaust system is found to be contaminated with deposits from grease-laden vapors, the contaminated portions of the exhaust ...
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When cleaning procedures are completed, all electrical switches and system components shall be returned to an operable state. [ 96: 11.6.12] ...
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