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What does the abbreviation FAN+NAT mean in tables for establishing the capacity of vents?

  1. Fan assist needed

  2. Fan assist non-applicable

  3. Fan assist and natural

  4. There are both fan assist and draft hood equipped appliances and there is no depressurization of the building

The correct answer is: There are both fan assist and draft hood equipped appliances and there is no depressurization of the building

FAN+NAT in tables for establishing the capacity of vents refers to the combination of three factors having both fan-assisted and natural draft appliances, and preventing depressurization of the building. Option A is incorrect because it only refers to the fan-assisted aspect and not the other two factors. Option B is incorrect because it implies that fan assist is not needed at all, while option C only mentions fan assist and natural draft but does not include the importance of preventing depressurization. Therefore, option D is the correct answer as it encompasses all three factors mentioned in the question. This combination is important in determining the proper ventilation capacity for a building in order to maintain proper air flow and prevent dangerous conditions.