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Technical Support - Code Facts

HVAC LogoFor answers to your code questions click on one of the categories below. If you can't find the answer you are looking for please email restechsupport@uniongas.com.

Please note that code answers below reference the most current B149 code book. To order a copy of the Ontario Natural Gas code, please contact:

CSA International
178 Rexdale Boulevard
Toronto, Ontario, M9W 1R3
P: 1-866-797-4272
Shop CSA (Search b149)

General

  1. What is the required clearance to meter/regulator?    (Residential Meter Set)
    To learn the correct clearances for all housing, for housing using side-wall vented appliances, and for housing using HRV's or mechanical air intake, please refer to our Guide for Natural Gas Meter, Regulator and Equipment Exterior Clearances – Union Gas form.
  2. Where do I find links to training facilities offering certifications (i.e. Corrugated Stainless Steel, ROT)? 
    On our Contractor Training Opportunities page, we have organized 3 different sections of training links: Natural Gas Training, Post Trade Training, and Safety Training.
Infraction Process
  1. When do I write an infraction?
    It is important to understand all situations that require a written infraction. Please refer to the green pages in your code book - Ontario Regulation 212/01 GASEOUS FUELS (Green Pages) Section 13 & 14, Page 21-22.
  2. How do I write an infraction correctly? 
    Find tips and directions for filling out the Union Gas Infraction Form. If you have any questions or require more forms, please contact your local Residential HVAC Specialist.

Customer Meters & Regulators

  1. When do I call for a meter upgrade when adding appliances (pool heaters, etc.)?
    When adding appliances, if the total connected load to the house is greater than 250cfh please fill out and submit a Residential HVAC Specialist. Union Gas will then determine whether or not a meter upgrade is required after reviewing your Request for Action Form (RFA).
  2. What is the required clearance to meter/regulator? 
    To learn the correct clearances for all housing, for housing using side-wall vented appliances, and for housing using HRV’s or mechanical air intake, please refer to our Guide for Natural Gas Meter, Regulator and Equipment Exterior Clearances – Union Gas form.
  3. What is considered a building opening? 
    Please refer to our Guide for Natural Gas Meter, Regulator and Equipment Exterior Clearances – Union Gas form.

Please Note that the following items do not conflict with meter placement and do not require clearance from a gas service regulator:

    • HRV exhaust vent
    • Central vacuum
    • Exhaust port
    • Bathroom exhaust port
    • Fixed windows
    • Fixed part of sliding glass doors
    • Range hood exhausts 
Reminder: Garage doors and garage man doors are considered building openings.

Piping & Tubing, Hose & Fittings

  1. What is the pipe size required for a specific application?
    Please refer to the following section in the code book (Most Up To Date Version: CAN/CSA-B149.1-10):
Annex A – Sizing and Capacities of Piping and Tubing for Natural Gas (Page 105 – 137 and 140, 167)
It is important to select the correct Pipe Sizing Material Table (i.e. Schedule 40/ Plastic or Copper). Also, check whether you are referring to Imperial or Metric to ensure your measurements remain correct.
Note: Union Gas delivery pressure is minimum 7” WC so use the appropriate chart 7” to 14” with a 1” WC pressure drop for low pressure systems.

Installation of specific types of appliances

Tankless Water Heaters

  1. What are the residential load requirements?
    If the total connected load to the house is greater than 250cfh please fill out and submit a Request for Action Form (RFA). Union Gas will then determine whether or not a meter upgrade is required after reviewing your Request for Action Form (RFA). Go to Get Connected to complete an application.
  2. What are the required clearances to the meter/regulator? 
    To learn the correct clearances from a gas service regulator vent opening and for all housing using side-wall vented appliances, and for housing using HRV’s or mechanical air intake, please refer to our Guide for Natural Gas Meter, Regulator and Equipment Exterior Clearances – Union Gas form.

Venting Systems & Air Supply for Appliances

  1. What is the required vent size for a specific appliance?
    First, determine the type of vent system(s) that you are dealing with and then please refer to the following section in the code book (Most Up To Date Version: CAN/CSA-B149.1-10) to calculate the proper size of vents and vent connectors:
Annex C – Vent Sizing Tables for Category I Natural Gas and Propane Appliances (Page 168 – 232)
  1. What is the correct process for correcting outside B-Vents? 
    TSSA is concerned that certain natural gas and propane burning appliances, such as furnaces and water heaters, are vented using unapproved exterior B-Vents which have been installed outdoors. It is important to refer to the correct process on the TSSA web site at: www.tssa.org/CorpLibrary/ArticleFile.asp?Instance=136&ID=19C473F64F974F698EF96356070EFB1E
Reminder: Please notify Union Gas by filling out TSSA's Attachment 2 form (refer to page 5) if you remove a piece of equipment that uses an unapproved outside B-Vent. This will allow Union Gas to remove the customer off of our B-Vent inspection list so that they no longer receive letters from Union Gas.
  1. In the enclosure of a room containing an appliance, what is the requirement size for combustion and dilution of air? 
    It is important to first determine if the house is constructed as described in Section 8.2.1 or 8.2.4 of the code book. You are then to use tables 8.1, 8.2, 8.3, and 8.4 found on pages 76 through 79 in the code book. Please note that the tables are specific to appliances that have draft control devices and those that don’t have draft control devices.
  1. What is considered a building opening?
    Please refer to our Guide for Natural Gas Meter, Regulator and Equipment Exterior Clearances – Union Gas form.
Please note that the following items do not conflict with meter placement and do not require clearance from a gas service regulator:
    • HRV exhaust vent
    • Central vacuum
    • Bathroom exhaust port
    • Fixed windows
    • Fixed part of sliding glass doors
    • Range hood exhausts 
Reminder: Garage doors and garage man doors are considered building openings.
  1. Am I allowed to mix venting material from different manufacturers? i.e. IPEX 636 and Royal venting
    No. System 636 Pipe, Fittings and Cements are certified as a system and must be installed as such. Different manufacturers have different materials, joining systems and adhesives. Do NOT mix pipe, fittings, solvents, or joining methods from different BH Vent manufacturers, this can result in unsafe conditions. Refer to manufacturer’s certified installation instructions or call the manufacturer for proper installation instructions.