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 Answer Key Question 1: Answer: “A” TRUE Eliminating all mold and mold spores indoors is virtually impossible, but controlling indoor moisture will control the growth of indoor mold. www.epa.gov/mold/moldcourse/chapter2.html#2.1

Question 2: Answer: “A” TRUE Some moisture problems have been linked to changes in building construction practices since the 1970s. These practices led to buildings that are tightly sealed but, in some cases, lack adequate ventilation. Without adequate ventilation, moisture may build up indoors and mold may grow. www.epa.gov/mold/moldcourse/chapter2.html#2.2

Question 3: Answer: “A” TRUE Humidity levels can rise in a building as a result of the use of humidifiers, steam radiators, moisture‐generating appliances such as dryers, and combustion appliances such as stoves. Cooking and showering also can add to indoor humidity. www.epa.gov/mold/moldcourse/chapter2.html#2.3

Question 4: Answer: “A” TRUE Condensation can be a sign of high humidity. When warm, humid air contacts a cold surface, condensation may form. www.epa.gov/mold/moldcourse/chapter2.html#2.3

Question 5: Answer: “A” TRUE If the HVAC system has insulation on the inside of the air ducts, and the insulation gets wet or moldy, it should be removed and replaced because the material cannot be cleaned effectively. Please note that there are no antimicrobial products or biocides approved by EPA for use on lined ductwork. www.epa.gov/mold/moldcourse/chapter2.html#2.4

Question 6: Answer: “B” FALSE Removing standing water under the cooling coils of air handlers by making sure the drain pans slope toward the drain and the drain is flowing freely. www.epa.gov/mold/moldcourse/chapter2.html#2.4

Question 7: Answer: “A” TRUE Molds gradually destroy whatever they grow on, so preventing mold growth also prevents damage to building materials and furnishings. www.epa.gov/mold/moldcourse/chapter2.html#2.5

Question 8: Answer: “B” FALSE When mold is suspected of causing damage to the structural integrity of a building, a structural engineer or other professional with relevant expertise should be consulted. www.epa.gov/mold/moldcourse/chapter2.html#2.5