510.7 Interior Installations. In buildings more than one

story in height, and in one-story buildings where the roof

102 2019 CALIFORNIA MECHANICAL CODE

EXHAUST SYSTEM

Notes:

1. Duct size stays the same throughout the duct system.
2. Smaller (inside) male duct end is always above or uphill (on sloped duct), to be self draining into larger (outside) female duct end.

FIGURE 510.5.3.2(2) BELL-TYPE DUCT CONNECTION

[NFPA 96: FIGURE 7.5.5.1(b)]

FIGURE 510.5.3 PERMITTED DUCT-TO HOOD COLLAR CONNECTION

[NFPA 96: FIGURE 7.5.2.2]

FIGURE 510.5.3.2(3) FLANGE WITH EDGE WELD DUCT CONNECTION

[NFPA 96: FIGURE 7.5.5.1(c)]

Notes:

1. Duct size decreases (going upward) with each telescope.
2. Smaller (inside) duct section shall be above or uphill (on sloped duct), to be self draining into larger (outside) duct.

FIGURE 510.5.3.2(1) TELESCOPING -TYPE DUCT CONNECTION

[NFPA 96: FIGURE 7.5.5.1(a)]

FIGURE 510.5.3.2(4) FLANGE WITH FILLED WELD DUCT CONNECTION

[NFPA 96: FIGURE 7.5.5.1(d)]

2019 CALIFORNIA MECHANICAL CODE 103

EXHAUST SYSTEMS any other purpose or distributed to any other persons or parti es.

510.7.5 Materials. For field-applied grease duct enclosures and factory-built grease duct enclosures, the materials and products shall be provided in accordance with Section 510.7.5.1 and Section 510.7.5.2.

(2) Through the roof or to the roof from outside in accor dance with Section 510.9.1, or through a wall in accor

Through the roof or to the roof from outside in accor dance with Section 510.9.1, or through a wall in accordance with Section 510.9.2. [NFPA 96:7.8.1] 510.9.1 Rooftop Terminations. Rooftop terminations shall be arranged with or provided with the following: (1) Not less than 10 feet (3048 mm) of horizontal clear ance from the outlet to adjacent buildings, property

Measures shall be taken to prevent physical damage 510.7.5.1 Protection from Physical Damage. to a covering or enclosure material. Damage to the covering or enclosure shall be repaired, and the covering or enclosure shall be restored in accordance with its intended listing and fire-resistance rating, and be acceptable to the Authority Having Jurisdiction. [NFPA 96:7.7.3.1, 7.7.3.2] 510.7.5.2 Inspection. In the event of a fire within a kitchen exhaust system, the duct, the enclosure, and the covering directly applied to the duct shall be inspected by qualified personnel to determine whether the duct, the enclosure, and the covering directly applied to the duct are structurally sound, capable of maintaining their fire protection functions, approved for continued operation, and acceptable to the Authority Having Jurisdiction. [NFPA 96:7.7.3.3] 510.7.6 Listed. For listed grease ducts, see Section 510.4. 510.7.7 Fire Doors. Where openings in the enclosure walls are provided, they shall be protected by listed fire doors of proper rating. Fire doors shall be installed in accordance with NFPA 80. Openings on other listed materials or products shall be clearly identified and labeled according to the terms of the listing and the manufacturer’s instructions and shall be acceptable to the Authority Having Jurisdiction. [NFPA 96:7.7.4.1 – 7.7.4.3] The fire door shall be readily accessible, aligned and of a size to allow access to the rated access panels on the ductwork. [NFPA 96:7.7.4.4] 510.7.8 Ducts with Enclosure(s). A duct system shall constitute an individual system serving exhaust hoods in one fire zone on one floor. Multiple ducts shall not be permitted in a single enclosure unless acceptable to the Authority Having Jurisdiction. [NFPA 96:7.7.5]