Gas Furnace

Gas Furnace Vent Ontario

Gas Furnace Vent Ontario

Comprehensive Overview of Gas Furnace Venting Requirements in Ontario

Gas furnace venting in Ontario is a crucial aspect of ensuring the safe and efficient operation of gas-burning appliances. This comprehensive guide will provide you with a detailed understanding of the general requirements, installation guidelines, and other important considerations for gas furnace venting in Ontario.

What are the General Requirements and Codes for Gas Furnace Venting in Ontario?

Gas furnace venting in Ontario is governed by the CSA B149.1-15 Natural Gas and Propane Installation Code. This code outlines specific requirements to ensure the safe and efficient operation of gas-burning appliances, including gas furnaces.

What are the Vent Pipe Installation Guidelines for Gas Furnaces in Ontario?

Material Types: For high-efficiency gas furnaces, vent pipes must be made of materials resistant to corrosion. The most commonly used materials are ABS, PVC, and CPVC, with PVC being the most popular choice. However, it’s important to note that ABS is prohibited for new installations in Canada due to its susceptibility to leaks and cracks. PVC used must be certified to specific standards (e.g., ULC S636).

PVC: PVC used for gas furnace venting must be FGV (flue gas vent) certified, not Schedule 40 DWV (drain PVC).
CPVC: CPVC is more resistant to corrosion and higher temperatures, and is often used for high-efficiency boilers.

What are the Vent Termination Requirements for Gas Furnaces in Ontario?

Height and Clearance:
– Grade Level: Vents must terminate at least 1 foot above grade level to prevent snow buildup and ensure proper venting.
– Windows and Doors: Vents must not terminate within specific distances of windows, doors, or non-mechanical air-supply inlets:
– Inputs up to 10,000 Btuh: 6 inches (150 mm).
– Inputs from 10,000 to 100,000 Btuh: 12 inches (300 mm).
– Inputs over 100,000 Btuh: 3 feet (900 mm).
– Sidewalks and Driveways: Vents must not terminate directly above paved sidewalks or driveways between two single-family dwellings or on public property unless they are at least 7 feet (2.1 meters) above.
– Mechanical Air-Supply Inlets: Vents must not terminate within 6 feet (1.8 meters) of mechanical air-supply inlets.

What are the Requirements for Direct Vent Installations for Gas Furnaces in Ontario?

Direct Vent Systems: These systems use a dedicated vent pipe that draws combustion air directly from outside and vents exhaust gases outside. The vent termination must comply with the above requirements.

Pest Protection: A mesh screen (max 1.5 cm) is recommended to keep pests out of the vent pipe.

What are the Steps to Install a Gas Furnace Vent in Ontario?

  1. Assess the Site: Determine the location of windows, doors, air intakes, and other obstructions, and ensure compliance with clearance requirements.
  2. Choose the Right Materials: Use certified PVC or CPVC vent pipes and fittings.
  3. Install the Vent Pipe: Ensure the vent pipe is positively sealed to prevent leaks, and use the correct type and brand of cement and fittings to match the existing pipe.
  4. Inspect and Test: Inspect the installation to ensure it meets all code requirements, and test the system to ensure proper venting and no leaks.
  5. Obtain Necessary Permits and Inspections: Obtain permits before starting the installation, and schedule an inspection by a certified gas technician or local authorities to ensure compliance.

What Tools and Devices are Required for Gas Furnace Venting in Ontario?

  • Pipe Cutters and Fittings: For cutting and assembling the vent pipe.
  • Cement and Primer: For sealing the joints.
  • Mesh Screens: For pest protection.
  • Elbows and Extensions: To adjust the vent termination height and direction.

What are the Costs and Calculations Involved in Gas Furnace Venting in Ontario?

  • Material Costs: Vary depending on the type and quality of materials used.
  • Labor Costs: Hiring a certified gas technician can range from $150 to $200 for minor corrections.
  • Calculations: Ensure the vent pipe diameter and length comply with the gas code requirements, and calculate the necessary clearances and heights based on the appliance’s input rating.

Reference Links:

  1. [Canadian HVAC Code Question – HVAC-Talk]
  2. [Questions of natural gas vents : r/ontario – Reddit]
  3. [Venting for High efficiency Gas Furnaces – Part 1 Materials]

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