When installing a gas water heater in California, what is the minimum clearance required from the draft hood to combustible materials according to the California Mechanical Code?
Correct Answer
D) 6 inches
California Mechanical Code Section 802.6.1 requires a minimum 6-inch clearance from the draft hood of a gas water heater to combustible materials. This clearance helps prevent fire hazards and ensures proper operation of the draft hood system.
Why This Is the Correct Answer
California Mechanical Code Section 802.6.1 requires a minimum 6-inch clearance between the draft hood of a gas water heater and any combustible materials. The draft hood manages flue gas flow and venting; during operation it can reach temperatures that would ignite adjacent combustibles if placed too close. The 6-inch clearance provides a thermal buffer to prevent fire hazards and ensures the draft hood can function properly without restriction or heat transfer to nearby framing or cabinets.
Why the Other Options Are Wrong
Option A: 9 inches
9 inches is not the required clearance under the California Mechanical Code for draft hoods. This figure may appear as a distractor because some appliance clearances in other contexts use 9 inches, but the specific code requirement for draft hoods to combustibles is 6 inches — not 9.
Option B: 3 inches
3 inches is insufficient clearance for a gas appliance draft hood. This distance would place combustible materials dangerously close to a high-temperature exhaust component. The code requires 6 inches specifically because 3 inches does not provide adequate protection against heat transfer and ignition risk.
Option C: 12 inches
12 inches exceeds the code requirement and would unnecessarily limit installation options in tight spaces. While additional clearance is never unsafe, the minimum required by the California Mechanical Code is 6 inches. Selecting 12 inches would be overly conservative and does not match the specific code provision tested here.
Memory Technique
Remember '6 inches from the hood' — think of a ruler (6 inches) held between the draft hood and the wall. Six is the minimum to keep combustibles from catching fire.
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