Gas Fitter Practice · Question
Which type of gas appliance requires a dedicated combustion air supply directly from outdoors, under most circumstances?
Category IV appliances are condensing, forced-draft appliances that require sealed combustion, drawing all combustion air directly from outside.
Start free practice for Gas Fitter Practice
200 questions · no signup required · 40 free questions per day
Question: Which type of gas appliance requires a dedicated combustion air supply directly from outdoors, under most circumstances?
Answer options:
- Category I
- Category III ✅ Category IV
- Atmospheric
Correct answer: Category IV
Explanation: Category IV appliances are condensing, forced-draft appliances that require sealed combustion, drawing all combustion air directly from outside.
Start free practice for Gas Fitter Practice
200 questions · no signup required · 40 free questions per day
More about Gas Fitter Practice
Related Questions
- What is the maximum allowed pressure for a propane system supplying a residential appliance?
- When installing a gas outdoor appliance, what is the minimum required clearance from an opening into a buildin
- Which code specifies the requirements for the installation of propane-burning appliances and equipment?
- What is the maximum allowed pressure drop for gas piping within a building, from the point of delivery to the
- Which of the following is the primary purpose of a drip leg (sediment trap) in a gas piping system?
- What is the minimum air-to-gas ratio required for complete combustion of natural gas?
More for Gas Fitter Practice candidates
Practice tests
Question explanations
- What is the maximum allowed pressure for a propane system supplying a residential appliance?
- When installing a gas outdoor appliance, what is the minimum required clearance from an opening into a buildin
- Which code specifies the requirements for the installation of propane-burning appliances and equipment?
- What is the maximum allowed pressure drop for gas piping within a building, from the point of delivery to the
Ready to practice?
Free, no signup required. Build a wrong-question list as you go.
Start Free Gas Fitter Practice Practice →Related courses
Other Canadian certifications candidates often prepare for alongside this one.