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Combustion Safety - Problem Set 3.4

  1. Which conditions for residences do not allow retrofit work to proceed without extensive combustion safety diagnostics or performance-based protocols, similar to those that qualify for appliance zone isolation?

    1. All combustion appliances are depressurization resistant.

    2. The residence is extremely leaky with little or no potential for depressurization.

    3. All vented combustion appliances are located in a space with only one connection to the residential living space.

    4. No vented combustion appliances are present in the residence.

  2. What level of depressurization indicates a successful zone isolation for combustion safety?

  3. Why is a worst-case appliance zone depressurization test not applicable to assessing combustion appliances that do not use indoor air for combustion?