A BH venting system or Special Venting system for a Category III or IV appliance installed as a direct vent 2 pipe installation is defined as a fan/blower assisted air intake and requires a 10ft (3m) clearance. Plastic regulator vent piping is not permitted inside buildings by NFPA 54. ICC Digital Codes is the largest provider of model codes, custom codes and standards used worldwide to construct safe, sustainable, affordable and resilient structures. [NFPA 54:9.3.8.3] Ducts shall not serve both upper and lower combustion air openings where both such openings are used. Install a regulator at the appliance. Based on the International Fuel Gas Code regulations, there are two ways to reduce the line pressure to the appliance to solve the customer’s problem. (NFPA). When measuring for clearances, start at the regulator/over pressure … The NFPA 54: National Fuel Gas Code is the field's most reliable source for general safety criteria for the installation and operation of fuel gas piping systems, appliances, equipment, and related accessories. Where the installation of a VLP will not 1st stage regulator per NFPA 58 (3.3.60.2 &6.8.1.1) Indoor or Piped Away Installations: Second Stage Regulators : The regulator vent must be piped to the out doors per NFPA 58. barometric draft regulators shall be installed in the same room or enclosure as the equipment in such a manner as to prevent any difference in pressure between the hood or regulator and the combustion air supply. www.nfpa.org 2. Refer to notes* below for Canadian installations. 5.01: Modifications to Chapter 1, Administration [nfpa 54:5.8.1] 1308.7.1 Overpressure Protection Where the gas supply design pressure in piping systems located indoors exceeds 2 psi (14 kPa) and line pressure regulators are installed to reduce the supply pressure to 14 inches water column (3.5 kPa) or less, the following shall apply: Improper vent installation or the absence of venting when required can lead to extremely hazardous conditions within a home or building. 3.3.106.2.4 Gas Vent, Type L Vent. The tables are found in the AGA and NFPAs publication called the National Fuel Gas Code, part 11 Sizing of Category I Venting Systems. Your venting system must not be blocked by any snow, snow drifts, or Pressure regulators shall be protected against physical damage. The regulator must be installed in accordance with the National Fuel Gas Code – NFPA 54 (National Fire Protection Association), the Liquefied Petroleum Gas Code – NFPA 58, and any local codes or guidelines established by the local authority having jurisdiction. customer’s appliances and equipment to the gas supply. CARBON MONOXIDE! 3.3.106.3 Regulator Vent. Fully updated and featuring a wealth of color visuals, NFPA's 2018 edition National Fuel Gas Code Handbook explains technical NFPA 54 requirements and fuel gas safety concepts -- so you can confidently answer questions from employees and owners, and verify that fuel gas piping, appliance, and venting jobs are in compliance. 2.3 National Fuel Gas Code (NFPA 54) 3.0 . REGULATOR INSTALLATION REGULATOR VENTING •NFPA 58, 5.8.3.1 •Pipe or tubing used to vent regulators shall be one of the following: • (1) Metal pipe and tubing in accordance with 5.9.3 • PVC meeting the requirements of UL 651, Schedule 40 or 80 Rigid PVC conduit. [NFPA 54:12.7.2(4)] The separation between ducts serving upper and lower combustion air openings shall be maintained to the source of combustion air. ... 3.3.84.4 Monitor regulator REVISED – The description of when the regulator operates is deleted and the term ... be inspected for compliance with the code’s combustion air and venting requirements where a structure is modified to reduce air infiltration. This chapter covers minimum safe performance, general appliance venting requirements, specification of venting, design and construction, type of venting system to be used for positive or negative vent systems and … The National Fuel Gas Code, ANSI Z223.1/NFPA 54, 2018, allows the use of plastic materials to be used for the venting of certian gas appliances.

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