Gas Fitter Practice Test

Which action is the most effective at reducing mold growth in a house?

1. Reducing relative humidity to approximately 10%

2. Increasing relative humidity to approximately 80%

3. Filtering the air in the house

4. Covering earthen floors and open water surfaces

The correct answer is: Covering earthen floors and open water surfaces

To effectively reduce mold growth in a house, covering earthen floors and open water surfaces is a highly effective action. Mold thrives in damp environments, and earthen floors or open water surfaces can provide the consistent moisture that mold needs to grow. By covering these areas, you eliminate a significant source of moisture, thereby creating a less hospitable environment for mold spores to settle and develop. Addressing relative humidity is also vital; however, reducing it to an extreme low like 10% may not be practical or healthy for indoor living, as that level of humidity can lead to other issues such as respiratory problems and damage to delicate materials in the home. Increasing humidity to 80% would actually encourage mold growth rather than mitigate it, making it counterproductive. Filtering the air can remove some mold spores present but does not address the underlying moisture issue that is crucial for mold growth prevention. Therefore, covering those critical areas is the most comprehensive and effective method for controlling moisture and consequently reducing mold proliferation in a home.