CSA Group's 2015 Gas Trade materials reference the Red Seal Program's trade outlines for your preparation to become a nationally recognized gasfitter. Please visit the Red Seal Program's website for more details.
Overview:
The main functions of venting systems are:
- To completely vent the flue gases to the outdoors without spillage into the building. (This ensures that the indoor air quality of the building is not compromised by installed appliances)
- To effectively vent at a rate that ensures the proper operation of the appliance
- To operate safely in terms of fire
- To keep the weather out of the building.
All forced-air gas-fired furnaces manufactured or sold in Canada after January 1, 2010, are required to be high-efficiency, condensing-type appliances that are vented into special venting systems (BH vents). However, there are still a large number of existing low- and mid-efficiency furnaces along with currently manufactured and existing water heaters, boilers, and space heaters that operate with natural draft venting systems.
It is more important that gas technicians/fitters understand the requirements for proper installation and operation of natural draft venting systems since technicians/fitters must make crucial decisions regarding the size, location, and type of material for natural draft vents.
Learning Objectives:
At the end of this unit you will be able to:
- Describe venting systems.
- Describe vent design and installation requirements.
- Size venting systems.
- Describe vent installation and assembly.
- Describe vent inspection.
- Locate and size air supplies for equipment with inputs of 400 MBtu/h or less and over 400 MBtu/h.
