Combustion Safety - Problem Set 2.1

Which of these is not a proper approach for evaluating combustion safety for gas-fired water heaters, boilers, and furnaces?

1. Evaluate CO concentrations in both the appliance flue and in the occupied space.

2. Assess whether the vent is installed according to code.

3. Operate appliances at low settings to prevent buildup of ambient CO.

4. Inspect vents and heat exchangers for corrosion or cracking.