A residential building in Michigan has a total conditioned floor area of 2,400 square feet. What is the minimum required ventilation rate in CFM according to Michigan Energy Code requirements?
Correct Answer
D) 72 CFM
Michigan Energy Code requires 0.03 CFM per square foot of conditioned floor area. 2,400 × 0.03 = 72 CFM minimum ventilation rate.
Why This Is the Correct Answer
Michigan Energy Code requires a minimum whole-house ventilation rate of 0.03 CFM per square foot of conditioned floor area. Multiplying 2,400 sq ft × 0.03 CFM/sq ft = 72 CFM. This is the correct minimum mechanical ventilation rate to ensure adequate indoor air quality in tightly constructed Michigan homes.
Why the Other Options Are Wrong
Option A: 84 CFM
84 CFM would correspond to a rate of 0.035 CFM/sq ft, which exceeds the code minimum. This is not the required rate and likely results from misremembering the multiplier.
Option B: 96 CFM
96 CFM corresponds to 0.04 CFM/sq ft — a higher-than-required rate. While providing more ventilation than the minimum, it is not what the code mandates as the minimum.
Option C: 60 CFM
60 CFM corresponds to 0.025 CFM/sq ft, which falls below the Michigan Energy Code minimum of 0.03 CFM/sq ft. Using this rate would result in a code violation.
Memory Technique
Think '3 cents per square foot': $0.03 per sq ft of conditioned space = 0.03 CFM/sq ft. For 2,400 sq ft, that's like paying $72 — the exact CFM answer.
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