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510.9 Termination of Type I Hood Exhaust System
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The exhaust system shall terminate as follows:
- Outside the building with a fan or duct.
- Through the roof or to the roof from outside in accordance with Section 510.9.1, or through a wall in accordance with Section 510.9.2. [NFPA 96:7.8.1]
Rooftop terminations shall be arranged with or provided with the following:
- Not less than 10 feet (3048 mm) of horizontal clearance from the outlet to adjacent buildings, property lines, and air intakes.
- Not less than 5 feet (1524 mm) of horizontal clearance from the outlet (fan housing) to a combustible structure.
- A vertical separation of 3 feet (914 mm) below an exhaust outlet for air intakes within 10 feet (3048 mm) of the exhaust outlet.
- The ability to drain grease out of traps or low points formed in the fan or duct near the termination of the system into a collection container that is noncombustible, closed, rainproof, and structurally sound for the service to which it is applied, and that will not sustain combustion.
- A grease collection device that is applied to exhaust systems that does not inhibit the performance of a fan.
- A listed grease collection system that is in accordance with Section 510.9.1(4) and Section 510.9.1(5).
- A listed grease duct in accordance with Section 507.4.7 or ductwork in accordance with Section 507.4.8.
- A hinged upblast fan supplied with flexible weatherproof electrical cable and service hold-open retainer to permit inspection and cleaning that is listed for commercial cooking equipment with the following conditions:
- Where the fan attaches to the ductwork, the ductwork is not less than 18 inches (457 mm) away from the roof surface, as shown in Figure 510.9.1.
- The fan discharges not less than 40 inches (1016 mm) away from the roof surface, as shown in Figure 510.9.1.
- Other approved fan, provided it is in accordance with the following criteria:
- The fan is in accordance with the requirements of Section 510.9.1(3) and Section 511.1.3.
- Its discharge or its extended duct discharge is in accordance with the requirements of Section 510.9.1(2). (See Section 511.1.3)
- Exhaust fan discharge is directed up and away from the roof surface. [NFPA 96:18.104.22.168]
Fans shall be provided with safe access and a work surface for inspection and cleaning. [NFPA 96:22.214.171.124]
Wall terminations shall be arranged with or provided with the following properties:
- Through a noncombustible wall with not less than 10 feet (3048 mm) of clearance from the outlet to adjacent buildings, property lines, grade level, combustible construction, electrical equipment or lines, and the closest point of an air intake or operable door or window at or below the plane of the exhaust termination. The closest point of an air intake or operable door or window above the plane of the exhaust termination shall be not less than 10 feet (3048 mm) in distance, plus 3 inches (76 mm) for each 1 degree (0.017 rad) from horizontal, the angle of degree being measured from the center of the exhaust termination to the center of the air intake, operable door or window, as indicated in Figure 510.9.2.
Exception: A wall termination in a secured area shall be permitted to be at a lower height above grade where acceptable to the Authority Having Jurisdiction.
- The exhaust flow shall be directed perpendicularly outward from the wall face or upward.
- The ductwork shall be pitched to drain the grease back into the hood(s) or with a drain provided to bring the grease back into a container within the building or into a remote grease trap.
- A listed grease duct shall comply with Section 510.3.3 through Section 510.3.7; other ducts shall comply with Section 510.5.
- An approved fan shall comply with the requirements of Section 510.9.2(3), and Section 511.1.1 or Section 511.1.3. [NFPA 96:7.8.3]
For SI units: 1 inch = 25.4 mm, 1 foot = 304.8 mm
- Fresh air intake (FAI) applies to an air intake, including an operable door or window.
FAI is same plane as exhaust or lower: 10 feet (min.) between closest edges.
FAI above plane of exhaust: 10 feet + 3 inches.
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