If the air changes per hour (ACH)are known to be less than 0.40, what method should a technician use to determine if indoor air can be used as combustion air?

Question

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When the air changes per hour (ACH) are known to be less than 0.40, the known air-infiltration rate method should be used to determine if indoor air can be used as combustion air. This method involves calculating or measuring the actual rate of air infiltration into the building, which is crucial for ensuring there is enough air for safe and efficient combustion.

If the Air Changes Per Hour (ACH)are Known to Be