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506.5.2 Pollution-Control Units
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The installation of pollution-control units shall be in accordance with the manufacturer's installation instructions and all of the following:
- Pollution-control units shall be listed and labeled in accordance with UL 1978.
- Fans serving pollution-control units shall be listed and labeled in accordance with UL 762.
- Pollution-control units shall be mounted and secured in accordance with the manufacturer's installation instructions and the International Building Code.
- Pollution-control units located indoors shall be listed and labeled for such use. Where enclosed duct systems, as required by Section 506.3.11, are connected to a pollution control unit, such unit shall be located in a room or space having the same fire-resistance rating as the duct enclosure. Access shall be provided for servicing and cleaning of the unit. The space or enclosure shall be ventilated in accordance with the manufacturer's installation instructions.
- A clearance of not less than 18 inches (457 mm) shall be maintained between the pollution-control unit and combustible material.
- Roof-mounted pollution-control units shall be listed for outdoor installation and shall be mounted not less than 18 inches (457 mm) above the roof.
- Exhaust outlets for pollution-control units shall be in accordance with Section 506.3.13.
- An airflow differential pressure control shall be provided to monitor the pressure drop across the filter sections of a pollution-control unit. When the airflow is reduced below the design velocity, the airflow differential pressure control shall activate a visual alarm located in the area where cooking operations occur.
- Pollution-control units shall be provided with a factory-installed fire suppression system.
- Service space shall be provided in accordance with the manufacturer's instructions for the pollution control unit and the requirements of Section 306.
- Wash-down drains shall discharge through a grease interceptor and shall be sized for the flow. Drains, shall be sealed with a trap or other approved means to prevent air bypass. Where a trap is utilized it shall have a seal depth that accounts for the system pressurization and evaporation between cleanings.
- Protection from freezing shall be provided for the water supply and fire suppression systems where such systems are subject to freezing.
- Duct connections to pollution-control units shall be in accordance with Section 506.3.2.3. Where water splash or carryover can occur in the transition duct as a result of a washing operation, the transition duct shall slope downward toward the cabinet drain pan for a length not less than 18 inches (457 mm). Ducts shall transition to the full size of the unit's inlet and outlet openings.
- Extra-heavy-duty appliance exhaust systems shall not be connected to pollution-control units except where such units are specifically designed and listed for use with solid fuels.
- Pollution-control units shall be maintained in accordance with the manufacturer's instructions.
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