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// CODE SNIPPET

803.0 Sizing of Category I Venting Systems

Uniform Mechanical Code 2018 of Nevada > 8 Chimneys and Vents > 803.0 Sizing of Category I Venting Systems
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803.1 Single Appliance Vent Table 803.1.2(1) Through Table 803.1.2(6)

Table 803.1.2(1) through Table 803.1.2(6) shall not be used where obstructions are installed in the venting system. The installation of vents serving listed appliances with vent dampers shall be in accordance with the appliance manufacturer's installation instructions or in accordance with the following:
  1. The maximum capacity of the vent system shall be determined using the NAT Max column.
  2. The minimum capacity shall be determined as though the appliance were a fan-assisted appliance, using the FAN Min column to determine the minimum capacity of the vent system. Where the corresponding "FAN Min" is "NA", the vent configuration shall not be permitted and an alternative venting configuration shall be utilized. [NFPA 54:13.1.1]

803.1.1 Vent Downsizing

Where the vent size determined from the tables is smaller than the appliance draft hood outlet or flue collar, the use of the smaller size shall be permitted provided that the installation is in accordance with the following requirements:
  1. The total vent height (H) is not less than 10 feet (3048 mm).
  2. Vents for appliance draft hood outlets or flue collars 12 inches (305mm) in diameter or smaller are not reduced more than one table size.
  3. Vents for appliance draft hood outlets or flue collars exceeding 12 inches (305 mm) in diameter are not reduced more than two table sizes.
  4. The maximum capacity listed in the tables for a fan-assisted appliance is reduced by 10 percent (0.90 × maximum table capacity).
  5. The draft hood outlet exceeds 4 inches (102 mm) in diameter. A 3 inch (76 mm) diameter vent shall not be connected to a 4 inch (102 mm) diameter draft hood outlet. This provision shall not apply to fan-assisted appliances. [NFPA 54:13.1.2]
SEE MORE

Related Code Sections


803.0 Chimneys and Vents, Sizing of Category I Venting Systems
VENT [NFPA 54: TABLE 13.1(a)]*   NUMBER OF APPLIANCES: SINGLE APPLIANCE TYPE: CATEGORY I APPLIANCE VENT CONNECTION ...
Uniform Mechanical Code 2018 of Nevada > 8 Chimneys and Vents > 803.0 Sizing of Category I Venting Systems
510.0 Water Heaters, Sizing of Category I Venting Systems
) TYPE B DOUBLE-WALL GAS VENT [NFPA 54: TABLE 13.1(a)]*   NUMBER OF APPLIANCES: SINGLE APPLIANCE TYPE: CATEGORY I APPLIANCE ...
Uniform Plumbing Code 2018 of Nevada > 5 Water Heaters > 510.0 Sizing of Category I Venting Systems
803.2.21 Chimneys and Vents, Vent Connector Sizing
Vent connectors shall not be increased more than two sizes greater than the listed appliance categorized vent diameter, flue collar diameter ...
Uniform Mechanical Code 2018 of Nevada > 8 Chimneys and Vents > 803.0 Sizing of Category I Venting Systems > 803.2 Multiple Appliance Vent Table 803.2(1) Through Table 803.2(9) > 803.2.21 Vent Connector Sizing
803.1.1 Chimneys and Vents, Vent Downsizing
Where the vent size determined from the tables is smaller than the appliance draft hood outlet or flue collar, the use of the smaller size shall ...
Uniform Mechanical Code 2018 of Nevada > 8 Chimneys and Vents > 803.0 Sizing of Category I Venting Systems > 803.1 Single Appliance Vent Table 803.1.2(1) Through Table 803.1.2(6) > 803.1.1 Vent Downsizing
803.2.14 Chimneys and Vents, Size of Vents for Multistory Installations
The size of the lowest connector and of the vertical vent leading to the lowest interconnection of a multistory system shall be in accordance ...
Uniform Mechanical Code 2018 of Nevada > 8 Chimneys and Vents > 803.0 Sizing of Category I Venting Systems > 803.2 Multiple Appliance Vent Table 803.2(1) Through Table 803.2(9) > 803.2.14 Size of Vents for Multistory Installations
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